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  1. Element: className property - Web APIs | MDN

    Learn about the Element.className property, including its type, code examples, specifications, and browser compatibility.... Examples js const el = document.getElementById("item");...has an empty class attribute . js elm.setAttribute("class", "my-class");...

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  2. HTMLElement: copy event - Web APIs | MDN

    Learn about the copy event, including its type, syntax, and properties, specifications and browser compatibility.... js addEventListener("copy", (event)...<h3>Log:</h3> <p id="log"></p> JavaScript js const log = document.getElementById("log");...

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  3. Window: alert() method - Web APIs | MDN

    Learn about the Window.alert() method, including its syntax, code examples, specifications, and browser compatibility.... Syntax js alert() alert(message) Parameters...None ( undefined ). Examples js window.alert("Hello world!");...

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  4. Function return values - Learn web development ...

    There's one last essential concept about functions for us to discuss — return values. Some functions don't return a significant value, but others do. It's important to understand what their values are, how to use them in your code, and how to make functions return useful values. We'll cover all of these below....previous article in this series): js const myText = "The weather is...somewhere on an HTML <canvas> : js function draw() { ctx.clearRect(0...

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  5. TypeError: derived class constructor returned i...

    The JavaScript exception "derived class constructor returned invalid value x" occurs when a derived class constructor returns a value that is not an object or undefined.... Examples Invalid cases js class Base { constructor() {}...returned invalid value 2 Valid cases js class Base { constructor() {}...

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  6. SyntaxError: invalid decimal escape in regular ...

    The JavaScript exception "invalid decimal escape in regular expression" occurs when a legacy octal escape sequence is used in a Unicode-aware regular expression pattern....Invalid cases js /\00/u; /\01/u; Valid cases js // If you want...

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  7. RangeError: repeat count must be less than infi...

    The JavaScript exception "repeat count must be less than infinity" occurs when the String.prototype.repeat() method is used with a count argument that is infinity.... Examples Invalid cases js "abc".repeat(Infinity); // RangeError...30); // RangeError Valid cases js "abc".repeat(0); // '' "abc"...

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  8. TypeError: invalid Array.prototype.sort argumen...

    The JavaScript exception "invalid Array.prototype.sort argument" occurs when the argument of Array.prototype.sort() (and its related methods: Array.prototype.toSorted(), TypedArray.prototype.sort(), TypedArray.prototype.toSorted()) isn't either undefined or a function which compares its operands.... Examples Invalid cases js [1, 3, 2].sort(5); // TypeError...toSorted("name"); // TypeError Valid cases js [1, 3, 2].sort(); // [1, 2, 3]...

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  9. DirectoryEntrySync - Web APIs | MDN

    Learn about the DirectoryEntrySync interface, including its methods, specifications and browser compatibility.... js const fileEntry = fs.root.getFile("logs...project_dir in the root directory. js const dirEntry = fs.root.get...

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  10. CSS Custom Highlight API - Web APIs | MDN

    The CSS Custom Highlight API provides a mechanism for styling arbitrary text ranges on a document by using JavaScript to create the ranges, and CSS to style them.... For example: js const parentNode = document....with the corresponding ranges. js const highlight = new Highlight(range1...

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