投稿時間:2021-09-25 11:28:43 RSSフィード2021-09-25 11:00 分まとめ(23件)

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IT	気になる、記になる…	【セール】スマホ版｢ドラゴンクエストモンスターズ｣シリーズが値下げセール中（10月3日まで）	https://taisy0.com/2021/09/25/146580.html	開催	2021-09-25 01:12:11
TECH	Engadget Japanese	ゲーミングディスプレーがお買い得！ Dell、ASUS、Acer、MSIなど｜Amazonタイムセール祭り	https://japanese.engadget.com/timesale-2109-gaming-display-012843983.html	amazon	2021-09-25 01:28:43
TECH	Engadget Japanese	タイムセール祭りで11000円OFF、Fire HD 10＋純正キーボードカバーレビュー	https://japanese.engadget.com/fire-hd-10-013037684-154531006-002143626-011702043.html	firehd	2021-09-25 01:17:02
TECH	Engadget Japanese	車から最大150WのAC＆50WのDC給電。急速充電にも対応したカーインバーター「PWINV」	https://japanese.engadget.com/pwinv-car-inverter-011542351.html	車に「PWINV」台があれば、スマホやノートPCなどのデバイスをいくら使っても、バッテリー残量が不足になり、急に電源が切れたという心配は要りません※本製品はVの車のみに対応可能です。	2021-09-25 01:15:42
TECH	Engadget Japanese	タイムセール祭りで25%オフ！ 「Echo Show 10」をエンタメデバイスとしてレビュー	https://japanese.engadget.com/amazon-echo-show-10-073000649-000438003-010117237.html	echoshow	2021-09-25 01:01:17
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	iPhoneでcssが効かない（inputタグcheckbox属性）	https://teratail.com/questions/361220?rss=all	iPhoneでcssが効かないinputタグcheckbox属性前提・実現したいこと現在Webアプリのようなものを作っており、お気に入り機能を作ろうとしています。	2021-09-25 10:59:27
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	heroku run rails db:migrateをするとエラーが出てしまいます	https://teratail.com/questions/361219?rss=all		2021-09-25 10:34:54
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	react typescript　「Could not find a required file.　index.js」のエラーで起動できない	https://teratail.com/questions/361218?rss=all	reacttypescript「Couldnotfindarequiredfileindexjs」のエラーで起動できないreacttypescriptのエラー解消方法教えていただきたいです。	2021-09-25 10:33:27
AWS	AWSタグが付けられた新着投稿 - Qiita	API GatewayをS3のプロキシとして作成してみる。	https://qiita.com/smiler5617/items/11c246fd521dee207560	今回の記事ではS内オブジェクトのダウンロードしかしないため。	2021-09-25 10:25:25
海外TECH	DEV Community	Making a Toggle Switch into a New HTML Element	https://dev.to/auroratide/making-a-toggle-switch-into-a-new-html-element-425c	Making a Toggle Switch into a New HTML ElementHey let s build a light bulb Or at least the on off switch part of the light bulb The toggle switch is a super common user interface element to indicate whether some feature is active or not Switches like these are in fact so common it would sure be nice if they were their own HTML element lt label gt lt strong gt Lightbulb lt strong gt lt toggle switch gt lt toggle switch gt lt label gt Well through the magic of web components it s actually possible to make this My goal is to illustrate one way how to both build and test a web component However instead of going step by step here s the code for making a toggle switch we re gonna acutally in some sense assemble a light bulb representing the key aspects to building a reusable web component which apply when creating any reusable element As we assemble this light bulb piece by piece we will also be making the toggle switch component we know and love So all that said let s build a light bulb Inventing a Light BulbSemantics The SchematicAccessibility The CapAttributes The Contact WiresJavascript The FilamentEvents The Inert GasStyling The GlobeSummaryFull CodeFor the code bits I will be assuming some familiarity with the following HTML CSS and Javascript see Getting Started with the Web Using npm to install dependencies see Beginner s Guide to Using npm Testing code with code see How to start unit testing Key TakeawaysHere s a bit of a tl dr showing all the big points to think about when creating web components Web Components create new semantics through custom elements Accessible components allow for multiple methods of interaction Attributes surface important state configuration and nuanced meaning Javascript functions expose key element behaviours and actions Events communicate key actions or changes for other elements to react to Styling is made available through carefully chosen CSS variables and shadow parts And here are all the web component coding ideas that are touched by implementing the lt toggle switch gt component See how we use them to build the component or just reference the resources below Constructing web components like a pro open wc testing provides useful testing helpers for putting our component on a web page web test runner runs our tests in a real browser Test Fixtures set up an element on a page for testing connectedCallback initializes an element when inserted onto the page Attributes and properties can be set on custom elements observedAttributes and attributeChangedCallback react to changes in attributes disconnectedCallback cleans up after an element when it is removed from the document oneEvent tests that an event has occurred Custom Events let you dispatch events specific to your component Shadow DOM encapsulates structure style and behaviour from the overall document Shadow Parts allow outside CSS to customize specific inner elements of a web component host lets you style the web component itself from its shadow dom I have also created a lt toggle switch gt web component you can install and use on your projects or use as reference Auroratide toggle switch Inventing a Light BulbIn each section I will Discuss an aspect of web components including why it is importantApply that aspect to building the lt toggle switch gt component with code Semantics The SchematicAll good inventions start off with a drawing showing the design Before building the web component we need to think about why we re building it Well what is a web component anyway To answer that question we need to answer a different question What is a block quote Well it s pretty common for articles like this one to want to quote someone or something for instance Thomas Edison To invent you need a good imagination and a pile of junk You can tell it s a quote of some kind by its formatting And thankfully the code to make this happen is quite simple lt blockquote gt lt p gt To invent you need a good imagination and a pile of junk lt p gt lt blockquote gt The lt blockquote gt bit is an HTML tag with special meaning When a developer uses it they are declaring that the following text is a section that is quoted from another source You see to achieve the formatting of a block quote I didn t need to use the blockquote element at all I could have used some other HTML element and forced it to look like a quote but while that may be useful for visual readers it would not be useful to bots or to readers relying on assistive technology to read the page out loud What is assistive technology Many people have disabilities which hinder them from using a site in common ways and so they rely on assistive technology to navigate the internet An example of such a technology is a screen reader which verbally reads the page so vision impaired people can understand the content In other words that blockquote tag has special meaning called semantics and those semantics allow anything reading the page to understand what the contents represent Just like block quotes most HTML elements have special semantics associated with them Ok Timothy what do block quotes have to do with web components So our goal is to create a new HTML element lt toggle switch gt Keeping in mind that most HTML elements have associated semantics this leads us to an interesting insight Web components create new semantics through custom HTML elements This is not normally the way I see web components described Usually web components are thought of in developer centric terms like reusability and encapsulation While those are indeed great goals and outcomes framing a web component in terms of its semantics really helps capture why we are making it and what it will do So when it comes to building a new component the first step is to understand what is its purpose and that helps you decide what its responsibilities and scope are For our lt toggle switch gt component it s pretty similar to a native HTML checkbox but with one distinction whereas a checkbox is either checked or unchecked our switch element is either on or off which is a subtly different semantic Also checkboxes have a third indeterminate value that is neither checked nor unchecked Such a third value does not make sense for an on off switch Once we have defined the what and why of the web component we can create a bit of scaffolding Let s start with a skeleton component toggle switch jsexport class ToggleSwitch extends HTMLElement static elementName toggle switch constructor super window customElements define ToggleSwitch elementName ToggleSwitch The customElements define global function is what actually defines a web component and it must be supplied with both the name of the element and a class extending an HTMLElement All of our eventual functionality will go into the ToggleSwitch class As for testing we are going to rely on two libraries open wc testing A testing library providing useful helpers for mounting our component web test runner A program that will actually run our tests against a real browserI m highlighting the against a real browser bit because doing so provides the highest confidence that the element as it behaves in tests will be the same as it behaves in the wild This is opposed to using something like jsdom which has classically had poor support for web components These libraries can be installed with npm npm i D open wc testing web test runnerWith that all we need now is a skeletal test file and the ability to run said test toggle switch spec jsimport expect from open wc testing import toggle switch js describe toggle switch gt it works gt expect to equal Running the test wtr node resolve spec jsAnd with that we are finally ready to start building out our lt toggle switch gt component Code Features Constructing web components like a pro open wc testing provides useful testing helpers for putting our component on a web page web test runner runs our tests in a real browser Accessibility The CapThe light bulb s cap is where it accesses its power Therefore the cap represents accessibility Accessibility is the practice of making things usable by as many people as possible regardless of ability or disability For example if a blind person is relying on a screen reader to read the page out loud to them then when they reach the toggle switch they need to be made aware that the element is indeed a switch It is a fairly broad topic that I cannot possibly cover in full here but when it comes to web components there are some key questions we can ask What role or set of roles does our component serve How will readers know what this component is and how to use it In what ways might people use this component and do we need to do anything special to accommodate those Accessible components allow for multiple methods of interaction Personally I like using accessibility as a starting point so that good practices are built into the component earlier rather than later Let s apply this concretely to the toggle switch For coding let s start by answering the key questions What role or set of roles does our component serve WAI ARIA defines a role called switch which actually fits our component perfectly If we specify this role on our component assistive technologies such as screen readers can inform their listeners that they can toggle something on and off What is WAI ARIA WAI ARIA stands for Accessible Rich Internet Applications and it essecially provides a framework for making advanced website stuff more accessible to people with disabilities How will readers know what this component is and how to use it Sometimes special labelling is needed to properly inform people who can t see the element what it is In our case we can rely on the switch role to do that when a screen reader encounters an element marked as a switch it should announce that the element is a switch without us having to do any extra work In what ways might people use this component and do we need to do anything special to accommodate those Besides clicking on the switch some people might not have or cannot use a mouse and hence the switch should be interactable via keyboard Taking these two concerns together this means We should set the role attribute to switch We should make the element focusable which can be done by setting tabindex see tabindex attribute To take care of the first item let s first write a test import fixture expect from open wc testing describe accessibility gt it default role async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el getAttribute role to equal switch This test does two things Create a fixture which contains our new toggle switch element Assert whether the element s accessible role is a switch The fixture function provided by open wc testing is rather nifty It essentially sets up an HTML document and puts our element onto the page allowing us to mess with and inspect it Our test implies we should set up our element to have the switch role immediately To do that we will rely on a lifecycle method called connectedCallback export class ToggleSwitch extends HTMLElement connectedCallback this setAttribute role switch What are lifecycle methods Just like how all living things are born and eventually die elements on a web page may come and go Lifecycle methods represent key moments for an element such as when it gets inserted on the page removed from the page or updated The connectedCallback function is called every time an element gets inserted into the page which is great for initialization What is different between connectedCallback and the constructor The constructor is called when an element is created for the first time whereas the connectedCallback is called just after the element is added to a page One way to think of it is if the same element is added to and removed from a page over and over again the constructor is only called once wherease connectedCallback is called each time it s added back to the page Here s a good summary of what to do with the constructor vs connectedCallback For our tabbable requirement the test and initialization is very similar Setting tabindex is all that s needed to make an element tabbable allowing keyboard users to access our switch export class ToggleSwitch extends HTMLElement connectedCallback this setAttribute role switch this setAttribute tabindex Now for our aria role there s actually a little bit more we need to do for our component to actually be an accessible switch Conveniently we ll be talking about that in the very next section Code Features Test Fixtures set up an element on a page for testing connectedCallback initializes an element when inserted onto the page Attributes The Contact WiresNext on our light bulb are the contact wires which supply power to the part that lights up This will represent attributes HTML elements have attributes which basically tell more about the element s current state or how it should work For example the lt blockquote gt element has an attribute called cite which is a link to the source of the quote lt blockquote cite the blockquote element gt lt p gt If the cite attribute is present it must be a valid URL lt p gt lt blockquote gt As such custom elements are also able to expose attributes Their three key uses are for State Such as an element s initial or current valueConfiguration Such as whether the element is disabled has input boundaries and so forthNuanced Meaning Specifying more details to an element s semantic valueAttributes surface important state configuration and nuanced meaning Regarding nuanced meaning a good example is the cite attribute on blockquote It doesn t have a functional purpose nor does it configure the element in any way It just enhances the element s meaning it s not just any quote but a quote from a particular source Building out the lt toggle switch gt element there is at least one important state we want to convey with an attribute whether the switch is on or off Let s follow these three steps for creating that attribute Determine a name and allowed values for the attribute Set a property for the attribute Determine whether a change in the attribute triggers a change on the element To mimic a bit how the vanilla checkbox input element works we ll call our attribute checked and it will be a boolean attribute meaning its presence or absence will represent true or false respectively lt off gt lt toggle switch gt lt toggle switch gt lt on gt lt toggle switch checked gt lt toggle switch gt Setting a property for the element s class essentially declares the attribute is important In truth any element can have any attribute so by creating a property we communicate that checked is important for the toggle switch class ToggleSwitch extends HTMLElement get checked return this hasAttribute checked set checked value if value this setAttribute checked else this removeAttribute checked And the interesting question does a change in checked require a change on the element I can think of at least two things that should change when the checked attribute is added or removed from the toggle switch The switch should animate but we ll get to that when we discuss styling The aria checked attribute should reflect the checked attribute what Recall from earlier that we are relying on the switch role for accessibility That role requires that an accessibility attribute called aria checked be set to either true or false So when checked is present aria checked must be true and when checked is absent aria checked must be false Let s write a test for that it checked attribute is updated async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el getAttribute aria checked to equal false el setAttribute checked expect el getAttribute aria checked to equal true In this test we first ensure that an unchecked toggle switch starts with an aria checked of false indicating it is off to accessibility stuff Then we add the checked attribute and verify that aria checked has changed to true Now to actually accomplish this in code requires using a cool feature of web components observedAttributes and attributeChangedCallback observedAttributes is just a list of attributes that the element should react to if changed And attributeChangedCallback is the function that gets fired when any of the listed attributes change class ToggleSwitch extends HTMLElement static get observedAttributes return checked attributeChangedCallback name oldValue newValue if name checked this setAttribute aria checked this checked toString And finally we will want to make sure the initial state is taken care of in connectedCallback class ToggleSwitch extends HTMLElement connectedCallback this setAttribute aria checked this checked toString Code Features Attributes and properties can be set on custom elements observedAttributes and attributeChangedCallback react to changes in attributes Javascript The FilamentAnd now for the part of the bulb that actually glows the filament As the heart of the light bulb it s fitting for the filament to represent the heart of our component the javascript API What is an API API stands for Application Programming Interface If you think of a car as a program then its API would be the steering wheel gas pedal and brake You cannot directly manipulate what the engine does and can only do so through those three accessible things As such an API exposes ways to use an element without needing to know all of its messy guts Although a web component could be as simple as just coloring text custom elements are additionally useful for bundling complex functionality into a single doodad For example the toggle switch component must allow someone to toggle it on and off and so a click action must be bound to do that Perhaps that s not surprising so what I find useful is to think of those potential actions as public javascript functions Another way of putting it if a reader is able to click the component to toggle it then there should be a toggle function available so that other javascript code can simulate the reader s action Javascript functions expose key element behaviours and actions For the toggle switch when someone clicks on it the element should go from off to on or from on to off As usual we start with a test describe toggling on and off gt it via clicking async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el checked to be false el click expect el checked to be true el click expect el checked to be false Here we are able to use the click function to simulate someone clicking the element To make this test pass all we have to do is listen for a click event and toggle the checked state We will do this in connectedCallback since that s a good place to handle initialization class ToggleSwitch extends HTMLElement connectedCallback this addEventListener click gt this checked this checked Looks great except Remember our key point Key element behaviours are exposed as Javascript functions This means we should have a toggle method exposing this is a key way not only readers can interact with the component but other javascript code can too In fact we ll make test for this as well describe toggling on and off gt it via the api async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el checked to be false el toggle expect el checked to be true el toggle expect el checked to be false This test is extremely similar to the previous test with the primary difference this uses a public function toggle rather than a user action clicking Doing this allows two things First we can actually simplify the event listener from above to use our new function class ToggleSwitch extends HTMLElement toggle gt this checked this checked connectedCallback this addEventListener click this toggle But additionally we can now clean up the event listener with the disconnectedCallback hook class ToggleSwitch extends HTMLElement disconnectedCallback this removeEventListener click this toggle As a mirror to connectedCallback the disconnectedCallback function is called every time the element is removed from the document It is most useful for cleaning up listeners it may have set up elsewhere Code Features disconnectedCallback cleans up after an element when it is removed from the document Events The Inert GasSo it turns out there s a part of a light bulb you can t see but is nonetheless important for it to work the inert gas The bulb is filled with special air that extends the lifetime of the filament Continuing our Light Bulb of Web Components the gas is represented by the event API stuff happening under the surface but significant for other things to react to changes in our component An event is essentially a tidbit of code declaring that something happened for instance Hey somebody toggled me on By emitting an event like this listeners can react with some appropriate action When building a web component we should think about what events it should emit that other elements may need to react to In fact this is the primary mechanism by which our lt toggle switch gt element will even be useful Events communicate key actions or changes for other elements to react to In essence our goal is for our element to be used like this const toggleSwitch document querySelector toggle switch toggleSwitch addEventListener toggle switch change e gt code toggling light dark mode Thinking about our lt toggle switch gt component again what are the key events we want it to emit For the most part there s just one whether its state changes from off to on or vice versa So whenever the checked state changes the element should emit an event To write a test we must ask three questions What is the event s name When does the event occur What details should be shipped with the event The answers to these questions will fit into this nice testing template import oneEvent fixture expect from open wc testing describe events gt it turned on async gt const el await fixture lt toggle switch gt lt toggle switch gt setTimeout gt WHEN const detail await oneEvent el NAME ASSERT DETAILS Answering the questions Name Since our event represents a change in the state we ll call the event toggle switch change When Let s emit the event any time checked is added or removed from the element Details Events can carry additional information so that listeners know both what happened and anything else that may be relevant For our one event it s probably important to know whether the switch was toggled on or toggled off so we ll add that to details If we plug these things into our testing template we get a decent test import oneEvent fixture expect from open wc testing describe events gt it turned on async gt const el await fixture lt toggle switch gt lt toggle switch gt setTimeout gt el checked true const detail await oneEvent el toggle switch change expect detail checked to be true The two important functions in this test are setTimeout provided by Javascript and oneEvent provided by open wc oneEvent just waits for one event to occur and times out with a failure if the event never occurs setTimeout adds our toggle to a list of things for Javascript to do eventually It s needed because if we didn t use it our event could potentially fire before we even started listening for it Ok let s actually emit the event now Since our event is custom to our new element we will dispatch a Custom Event and since we want to do it any time checked changes we ll perform the dispatch with the code that reacts to when that attribute changes class ToggleSwitch extends HTMLElement attributeChangedCallback name oldValue newValue if name checked this setAttribute aria checked this checked toString this dispatchEvent new CustomEvent toggle switch change detail checked this checked Code Features oneEvent tests that an event has occurred Custom Events let you dispatch events specific to your component Styling The GlobeSo we ve done all this coding so far but we can t actually see the switch yet Let s finally put the globe on our light bulb by adding some styling to our element To be honest styling web components is entirely deserving of its own article made both interesting and complicated by a tiny thing called the Shadow DOM MDN covers using the shadow dom in good detail so for the purposes of this article we ll talk about it just enough to style the lt toggle switch gt Shadow DOM allows web components to in essence carry around their own personal document hidden from the primary web page document It s kind of like flowers As a gardener you can t tell a flower what shape to take or how many petals to have as that s determined by its own DNA You can determine how many flowers are in your garden and maybe you can influence some of the flower s colors by feeding it colored water but beyond that you don t get much say Similarly an element s shadow dom flower is encapsulated from the rest of the document meaning the document gardener cannot directly influence elements defined in the shadow dom neither can different web components clash with each other This turns out to be rather important for lt toggle switch gt because we now have competing concerns We must use the shadow dom to give our element a decent default switch look But we also want developers to customize it from outside the component to fit their website s look and feelThese competing concerns are incredibly common and therefore the shadow dom is actually not completely impenetrable Although the parent document can never arbitrarily customize stuff in the shadow dom there are a few exceptions CSS variables can take on values from beyond the shadow dom Elements within the shadow dom can be assigned shadow part names which can be directly selected with CSS These exceptions form a web component s Styling API specifically defined opportunities for customization And just like how we have to intentionally decide what attributes javascript functions and events to expose we also have to choose what CSS variables or parts can be styled Styling is made available through carefully chosen CSS variables and shadow parts Earlier I said we must use the shadow dom Why In our case we want to maintain the internal structure of the element which means it shouldn t be exposed to the outside Deciding what goes in shadow dom or not is important for creating an element s style API but is complex enough to merit its own article This stack overflow post helped me understand this concept and links to other useful resources At long last let s style this web component To make the switch easy to customize we are going to minimally style it Our base switch is gonna be just a square that moves back and forth along a track like this First we must attach a shadow root to the element and create a basic template for our element const template document createElement template template innerHTML lt style gt CSS HERE lt style gt lt span part track gt lt span part slider gt lt span gt lt span gt class ToggleSwitch extends HTMLElement constructor super this attachShadow mode open appendChild template content cloneNode true Of note we want developers using this toggle switch to be able to customize both the sliding bit and the track underneath it so to make that possible we are assigning shadow parts to each element This will make it possible for users to style those specific components like this toggle switch part slider border radius em With the basic template structure done all that s left is adding CSS All CSS added will go into the style tag in the template above First let s give the element some basic sizing host display inline block width em height em cursor pointer span box sizing border box display inline block line height Two things of interest here The host selector is special in the context of shadow dom It basically means style the thing that contains the shadow dom which is the web component itself In our case this styles the toggle switch tag The span only selects spans within the shadow dom of the element It does not globally style all spans on the page That s part of the power of encapsulation Next we ll style the track and slider to look like our squareish examples part track width height background color dddddd text align left part slider width height background color vertical align text top And for the last part we need to style what the component looks like when it has been checked Recall that the checked attribute on the lt toggle switch gt tag determines its on off state This can be selected for with an attribute selector using host part track part slider transition all ms host checked part slider transform translateX Code Features Shadow DOM encapsulates structure style and behaviour from the overall document Shadow Parts allow outside CSS to customize specific inner elements of a web component host lets you style the web component itself from its shadow dom We Invented a Light Bulb And with that we just covered the six key aspects to building great web components And in the process we built both a light bulb and a toggle switch Web Components create new semantics through custom elements Accessible components allow for multiple methods of interaction Attributes surface important state configuration and nuanced meaning Javascript functions expose key element behaviours and actions Events communicate key actions or changes for other elements to react to Styling is made available through carefully chosen CSS variables and shadow parts But is it truly complete Almost There are a few things I skipped over to simplify the tutorial Accessibility How do we label the switch Can we integrate this with the HTML label element Javascript When someone tabs to the toggle can they activate it by pressing Enter or Space Attributes Can a toggle switch be disabled like other HTML input controls Feel free to try to tackle these issues yourself Or see how it all works in my implementation of the lt toggle switch gt element on Github Auroratide toggle switch Full Codeconst template document createElement template template innerHTML lt style gt host display inline block width em height em cursor pointer span box sizing border box display inline block line height part track width height background color dddddd text align left part slider width height background color vertical align text top part track part slider transition all ms host checked part slider transform translateX lt style gt lt span part track gt lt span part slider gt lt span gt lt span gt export class ToggleSwitch extends HTMLElement static elementName toggle switch static get observedAttributes return checked constructor super this attachShadow mode open appendChild template content cloneNode true connectedCallback this setAttribute role switch this setAttribute tabindex this addEventListener click this toggle disconnectedCallback this removeEventListener click this toggle attributeChangedCallback name oldValue newValue if name checked this setAttribute aria checked this checked toString this dispatchEvent new CustomEvent toggle switch change detail checked this checked get checked return this hasAttribute checked set checked value if value this setAttribute checked else this removeAttribute checked toggle gt this checked this checked window customElements define ToggleSwitch elementName ToggleSwitch import fixture expect from open wc testing describe toggle switch gt describe accessibility gt it default role async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el getAttribute role to equal switch it tabbing async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el getAttribute tabindex to equal describe attributes gt it checked attribute is updated async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el getAttribute aria checked to equal false el setAttribute checked expect el getAttribute aria checked to equal true describe toggling on and off gt it via clicking async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el checked to be false el click expect el checked to be true el click expect el checked to be false it via the api async gt const el await fixture lt toggle switch gt lt toggle switch gt expect el checked to be false el toggle expect el checked to be true el toggle expect el checked to be false describe events gt it turned on async gt const el await fixture lt toggle switch gt lt toggle switch gt setTimeout gt el checked true const detail await oneEvent el toggle switch change expect detail checked to be true Constructing web components like a pro open wc testing provides useful testing helpers for putting our component on a web page web test runner runs our tests in a real browser Test Fixtures set up an element on a page for testing connectedCallback initializes an element when inserted onto the page Attributes and properties can be set on custom elements observedAttributes and attributeChangedCallback react to changes in attributes disconnectedCallback cleans up after an element when it is removed from the document oneEvent tests that an event has occurred Custom Events let you dispatch events specific to your component Shadow DOM encapsulates structure style and behaviour from the overall document Shadow Parts allow outside CSS to customize specific inner elements of a web component host lets you style the web component itself from its shadow dom	2021-09-25 01:40:05
Apple	AppleInsider - Frontpage News	Apple TV+ reportedly had less than 20M subscribers in US and Canada as of July	https://appleinsider.com/articles/21/09/25/apple-tv-reportedly-had-less-than-20m-subscribers-in-us-and-canada-as-of-july?utm_medium=rss	Apple TV reportedly had less than M subscribers in US and Canada as of JulyA union representing TV and movie workers says Apple pays lower rates to production crews than competing streaming firms because it has comparatively fewer subscribers A spokesman for the International Alliance of Theatrical Stage Employees told CNBC that Apple cited Apple TV subscriber numbers of less than million people as of July That statistic enables Apple to pay crews a lower rate than larger platforms like Netflix and Disney According to an existing contract high budget streaming productions can pay workers at a discounted rate if their combined U S and Canada subscriber numbers are under a threshold of million people the report said A copy of the contract seen by CNBC reveals labor stipulations for streaming productions are less stringent than those maintained for traditional broadcast TV projects because profitability in the sector is presently uncertain Read more	2021-09-25 01:59:27
Apple	AppleInsider - Frontpage News	Apple says iPhone 13 Pro ProMotion available to all apps, fix for Core Animation issue coming soon	https://appleinsider.com/articles/21/09/25/apple-says-iphone-13-pro-promotion-available-to-all-apps-fix-for-core-animation-issue-coming-soon?utm_medium=rss	Apple says iPhone Pro ProMotion available to all apps fix for Core Animation issue coming soonApple has responded to speculation that it is limiting third party developer access to ProMotion technology saying all apps can access the feature through a plist entry The company has also identified a Core Animation bug that could be contributing to the issue On Friday developers reported apparent issues in iOS on iPhone Pro that cap some third party app animations at Hz The handset is the first iPhone to implement ProMotion technology which enables dynamically variable refresh rates of up to Hz Apple confirmed to AppleInsider that all developers can take advantage of ProMotion s range of refresh rates on iPhone Pro but there is a caveat Read more	2021-09-25 01:21:25
Apple	AppleInsider - Frontpage News	iPhone 13 mini review: The most powerful small smartphone on the market	https://appleinsider.com/articles/21/09/24/iphone-13-mini-review-the-most-powerful-small-smartphone-on-the-market?utm_medium=rss	iPhone mini review The most powerful small smartphone on the marketThe iPhone mini has both fans and detractors of its size and has spawned debates about where it fits in Apple s lineup ーbut there s no denying that it s a flagship smartphone Apple s iPhone mini ーthe fastest and best small smartphone Once upon a time we all had mini iPhones The original iPhone was sleek metal and plastic and was smaller than every iPhone currently shipping Read more	2021-09-25 01:36:08
海外ニュース	Japan Times latest articles	China frees two Canadians after Huawei CFO flies home, ending crisis	https://www.japantimes.co.jp/news/2021/09/25/asia-pacific/huawei-meng-wanzhou-released/	China frees two Canadians after Huawei CFO flies home ending crisisThe seemingly intractable impasse came to a rapid resolution Friday after Huawei s Meng Wanzhou struck a deferred prosecution agreement with U S authorities	2021-09-25 10:40:07
海外ニュース	Japan Times latest articles	‘Quad’ leaders agree to meet annually in latest pushback against China	https://www.japantimes.co.jp/news/2021/09/25/asia-pacific/quad-washington-meeting/	Quad leaders agree to meet annually in latest pushback against ChinaU S President Joe Biden called the framework a group of democratic partners who share a worldview and have a common vision for the future	2021-09-25 10:15:14
海外ニュース	Japan Times latest articles	Supersonic hits quiet mode on its summer party	https://www.japantimes.co.jp/culture/2021/09/25/music/supersonic/	domestic	2021-09-25 10:00:41
ニュース	BBC News - Home	Canadians Michael Spavor and Michael Kovrig released from Chinese detention	https://www.bbc.co.uk/news/world-us-canada-58687071?at_medium=RSS&at_campaign=KARANGA	canada	2021-09-25 01:50:03
ニュース	BBC News - Home	Ryder Cup: US dominate Europe in Friday's opening day at Whistling Straits	https://www.bbc.co.uk/sport/golf/58682632?at_medium=RSS&at_campaign=KARANGA	Ryder Cup US dominate Europe in Friday x s opening day at Whistling StraitsJon Rahm and Sergio Garcia strike first for Europe but the US win both sessions to open their biggest lead over Europe after day one at a Ryder Cup	2021-09-25 01:20:20
ニュース	BBC News - Home	McIlroy left out of Ryder Cup session for first time	https://www.bbc.co.uk/sport/golf/58687083?at_medium=RSS&at_campaign=KARANGA	session	2021-09-25 01:31:35
ビジネス	ダイヤモンド・オンライン - 新着記事	トスネット(4754)、「増配」と「記念配当の実施」を 発表して、配当利回り2.6％に！ ”設立45期目”となる 2021年9月期は前期比10円増の｢1株あたり15円｣に！ - 配当【増配・減配】最新ニュース！	https://diamond.jp/articles/-/283091		2021-09-25 10:05:00
LifeHuck	ライフハッカー［日本版］	日常が贅沢に。しおりとしても使えるハイセンス文具「Phi Marker」	https://www.lifehacker.jp/2021/09/machi-ya-phi-marker-start.html	phimarker	2021-09-25 10:30:00
北海道	北海道新聞	保育園閉鎖で２人きりか　男と死亡３歳児、コロナで	https://www.hokkaido-np.co.jp/article/592843/	大阪府摂津市	2021-09-25 10:04:55
北海道	北海道新聞	華為副会長、中国に帰国へ　米と司法取引、責任認める	https://www.hokkaido-np.co.jp/article/592887/	司法取引	2021-09-25 10:19:00