The HTMLElement property inert is a Boolean that, when present, makes the browser "ignore" user input events for the element, including focus events and events from assistive technologies. The browser may also ignore page search and text selection in the element. This can be useful when building UIs such as modals where you would want to "trap" the focus inside the modal when it's visible.


isInert = HTMLElement.inert;

HTMLElement.inert = true | false;


A Boolean which is true if the element is inert; otherwise, the value is false.



  <label for="button1">Button 1</label>
  <button id="button1">I am not inert</button>
<div inert>
  <label for="button2">Button 2</label>
  <button id="button2">I am inert</button>


[inert] > * {
  opacity: .5;

Note that the attribute, by itself, will not cause any visual change to the content as displayed in the browser. In the example above, CSS has been applied so that any direct descendant of an element with the inert attribute is rendered semi-opaque.


Specification Status Comment
HTML Living Standard
The definition of 'HTMLElement.inert' in that specification.
Living Standard

Browser compatibility

BCD tables only load in the browser

See also