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/DOM

window.focus

Makes a request to bring the window to the front. It may fail due to user settings and the window isn't guaranteed to be frontmost before this method returns.

Syntax

window.focus() 

Example

if (clicked) { window.focus(); }

Specification

Specification Status Comment
WHATWG HTML Living Standard
The definition of 'Window.focus()' in that specification.
Living Standard

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https://developer.mozilla.org/en-US/docs/Web/API/window/focus