GlobalEventHandlers.onselectstart

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The onselectstart property of the GlobalEventHandlers mixin is an event handler that processes selectstart events.

The selectstart event fires when the user starts to make a new text selection on a webpage.

Syntax

object.onselectstart = functionRef;

functionRef is a function name or a function expression. The function receives a FocusEvent object as its sole argument.

document.onselectstart = function() {
  console.log('Selection started!');
};

For a full example, see our Key quote generator demo.

document.onselectstart = () => {
  return false; // cancel selection
};

Specification
Selection API # dom-globaleventhandlers-onselectstart

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`onselectstart`	1	12	52	4	15	1.3	1	18	52	14	1 The `selectstart` event never fires and never invokes this handler.	1.0