• A behavior applied to an HTML element via the inert attribute, causing the browser to ignore the element and all its descendants for the purposes of user interaction and accessibility. Inert elements become unfocusable, unclickable, and hidden from the accessibility tree. Inertness is typically used to exclude off-screen or inactive UI regions—such as background content behind a modal—from keyboard navigation and assistive technology without removing them from the DOM.

1. Related terms: Accessibility Object Model · Assistive technology
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