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js

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  1. NaN - JavaScript | MDN

    The NaN global property is a value representing Not-A-Number.... js NaN === NaN; // false Number...the value is currently NaN : js isNaN("hello world"); // true...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  2. Proxy - JavaScript | MDN

    The Proxy object enables you to create a proxy for another object, which can intercept and redefine fundamental operations for that object.... js const target = { message1: "hello"...just like the original target: js console.log(proxy1.message1);...

    developer.mozilla.org/en-US/docs/Web/JavaScript...
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  3. MessageEvent - Web APIs | MDN

    Learn about the MessageEvent interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....this: js const myWorker = new SharedWorker("worker.js"); Both...started using its start() method: js myWorker.port.start(); When the...

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  4. HTMLMediaElement: ended event - Web APIs | MDN

    Learn about the ended event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("ended", (event)...firing. Using addEventListener() : js const video = document.querySelector("video");...

    developer.mozilla.org/en-US/docs/Web/API/HTMLMe...
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  5. Window: offline event - Web APIs | MDN

    Learn about the offline event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("offline", (event)...HTMLFrameSetElement SVGSVGElement Examples js // addEventListener version window...

    developer.mozilla.org/en-US/docs/Web/API/Window...
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  6. Element: removeAttribute() method - Web APIs | MDN

    Learn about the Element.removeAttribute() method, including its syntax, code examples, specifications, and browser compatibility.... Syntax js removeAttribute(attrName) Parameters...you set them to null . Examples js // Given: <div id="div1" disabled...

    developer.mozilla.org/en-US/docs/Web/API/Elemen...
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  7. Using the Page Visibility API | MDN Blog

    This post takes a look at what page visibility is, how you can use the Page Visibility API in your applications, and describes pitfalls to avoid if you build features around this functionality....hidden Boolean property: js console.log(document.visibilityState);...checking the visibility manually: js document.addEventListener("visibilitychange"...

    developer.mozilla.org/en-US/blog/using-the-page...
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  8. HTMLMediaElement: canplaythrough event - Web AP...

    Learn about the canplaythrough event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("canplaythrough"...firing. Using addEventListener() : js const video = document.querySelector("video");...

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  9. HTMLAudioElement - Web APIs | MDN

    Learn about the HTMLAudioElement interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....using the Audio() constructor: js const audioElement = new Audio("car_horn...play() method on the element js audioElement.play(); Note: A...

    developer.mozilla.org/en-US/docs/Web/API/HTMLAu...
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  10. HTMLMediaElement: pause event - Web APIs | MDN

    Learn about the pause event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("pause", (event)...firing. Using addEventListener() : js const video = document.querySelector("video");...

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