The JavaScript strict mode-only exception
"'caller', 'callee', and 'arguments' properties may not be accessed on strict mode functions or the arguments objects for calls to them" occurs when the
deprecated arguments.callee, Function.prototype.caller, or Function.prototype.arguments properties
are used.... js "use strict"; function myFunc()...article for more information). js "use strict"; function f(n) {...
Learn about the HTMLInputElement.value property, including its type, code examples, specifications, and browser compatibility.... js const logElement = document....time a change event is fired. js const logElement = document....
Learn about the RelativeOrientationSensor interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility.... js const options = { frequency:... () => { // model is a Three.js object instantiated elsewhere...
The JavaScript warning "unreachable code after return statement" occurs when using an
expression after a return statement, or when using a
semicolon-less return statement but including an expression directly after....function Examples Invalid cases js function f() { let x = 3; x +=...is never reached } Valid cases js function f() { let x = 3; x +=...
Learn about the invalid event, including its type and syntax, code examples, specifications, and browser compatibility.... js addEventListener("invalid", (event)...<ul id="log"></ul> JavaScript js const input = document.querySelector("input");...
Learn about the pageshow event, including its type, syntax, and properties, code examples, specifications, and browser compatibility.... js addEventListener("pageshow",...and pagehide events. JavaScript js const events = ["pagehide", "pageshow"...
Learn about the dragstart event, including its type, syntax, and properties, code examples, specifications, and browser compatibility.... js addEventListener("dragstart"...{ opacity: 0.5; } JavaScript js const source = document.getE...
Learn about the dragend event, including its type, syntax, and properties, code examples, specifications, and browser compatibility.... js addEventListener("dragend", (event)...{ opacity: 0.5; } JavaScript js const source = document.getE...
Learn about the CSSMathSum interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....20px); } We add the JavaScript js const styleMap = document.querySelector("div")...write the last three lines as: js console.log(styleMap.get("width")...
Extensions developed with WebExtension APIs have a Content Security Policy (CSP) applied to them by default. This restricts the sources from which they can load code such as