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.

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
};

• selectstart event
• Related event handler: GlobalEventHandlers.onselectionchange