Element: contentvisibilityautostatechange event

The contentvisibilityautostatechange event fires on any element with content-visibility: auto set on it when it starts or stops being relevant to the user and skipping its contents.

While the element is not relevant (between the start and end events), the user agent skips an element's rendering, including layout and painting, which can significantly improve page rendering speed. The contentvisibilityautostatechange event provides a way for an app's code to also start or stop rendering processes (e.g. drawing on a <canvas>) when they are not needed, thereby conserving processing power.

Note that even when hidden from view, element contents will remain semantically relevant (e.g. to assistive technology users), so this signal should not be used to skip significant semantic DOM updates.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("contentvisibilityautostatechange", (event) => {});
oncontentvisibilityautostatechange = (event) => {};

Note: The event object is of type ContentVisibilityAutoStateChangeEvent.

Examples

js
const canvasElem = document.querySelector("canvas");

canvasElem.addEventListener("contentvisibilityautostatechange", stateChanged);
canvasElem.style.contentVisibility = "auto";

function stateChanged(event) {
  if (event.skipped) {
    stopCanvasUpdates(canvasElem);
  } else {
    startCanvasUpdates(canvasElem);
  }
}

// Call this when the canvas updates need to start.
function startCanvasUpdates(canvas) {
  // …
}

// Call this when the canvas updates need to stop.
function stopCanvasUpdates(canvas) {
  // …
}

Specifications

Specification
CSS Containment Module Level 2
# content-visibility-auto-state-change

Browser compatibility

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desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
contentvisibilityautostatechange event

Legend

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Full support
Full support
Partial support
Partial support
No support
No support
Has more compatibility info.

See also