The JavaScript strict mode-only exception
"for-in loop head declarations may not have initializers"
occurs when the head of a for...in contains
an initializer expression, such as for (var i = 0 in obj). This is not
allowed in for-in loops in strict mode. In addition, lexical declarations with initializers like for (const i = 0 in obj) are not allowed outside strict mode either....View this page on GitHub • Report a problem with this content...
The HTTP Viewport-Width request header is a device client hint which provides the client's layout viewport width in CSS pixels.
The value is rounded up to the smallest following integer (i.e., ceiling value)....View this page on GitHub • Report a problem with this content...
The HTTP Content-Security-Policy base-uri directive restricts the URLs which can be used in a document's element. If this value is absent, then any URI is allowed. If this directive is absent, the user agent will use the value in the element....View this page on GitHub • Report a problem with this content...
Learn about the Gamepad interface, including its properties, specifications and browser compatibility....View this page on GitHub • Report a problem with this content...
Learn about the OscillatorNode interface, including its constructor, properties, and methods, code examples, specifications, and browser compatibility....View this page on GitHub • Report a problem with this content...
The aria-checked attribute indicates the current "checked" state of checkboxes, radio buttons, and other widgets....View this page on GitHub • Report a problem with this content...
Learn about the RTCEncodedAudioFrame interface, including its properties and methods, code examples, specifications, and browser compatibility....View this page on GitHub • Report a problem with this content...