coderef

Content IndexLimited availability

The Content Index API allows developers to register their offline enabled content with the browser.

Not yet supported in all major browsers — check the table and provide a fallback.

How to use ↓Compare browsers

Browser support

DesktopChrome
✕Not supportedup to 155
Current: 155
Edge
✕Not supportedup to 154
Current: 154
Firefox
✕Not supportedup to 157
Current: 157
Safari
✕Not supportedup to 27
Current: 27
MobileChrome Android
18–83Not supported
84+Supportedsince Jul 27, 2020
Current: 155
Firefox Android
✕Not supportedup to 157
Current: 157
Safari iOS
✕Not supportedup to 27
Current: 27

How to use

Not supported in Chrome, Edge, Firefox, Safari, Firefox Android, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.

Example

Full syntax and examples are on MDN: ContentIndex.

Feature detection

JS · check before using
if ("ContentIndex" in globalThis) {
  // ContentIndex is available
} else {
  // load a polyfill or use a fallback
}

Documentation (MDN)

Specification

Sub-features

Support for each part of the feature (9). The overall table above shows when the whole feature works.

Sub-featureChromeEdgeFirefoxSafariChrome AndroidFirefox AndroidSafari iOS
ContentIndex✕✕✕✕84✕✕
ContentIndex.add✕✕✕✕84✕✕
ContentIndex.delete✕✕✕✕84✕✕
ContentIndex.getAll✕✕✕✕84✕✕
ContentIndexEvent✕✕✕✕84✕✕
ContentIndexEvent.ContentIndexEvent✕✕✕✕84✕✕
ContentIndexEvent.id✕✕✕✕84✕✕
ServiceWorkerGlobalScope.contentdelete_event✕✕✕✕84✕✕
ServiceWorkerRegistration.index✕✕✕✕84✕✕