Web features explorer

Import assertions

This feature is discouraged — Import assertions are superseded by import attributes.

Consider using CSS import attributes , JSON import attributes instead.

For more information, see: tc39/proposal-import-attributes/pull/131 (GitHub)

Module import … assert { type: "json" } and import … assert { type: "css" } JavaScript statements load JSON and CSS data.

Browser support

  • Chrome Not supported Bugs:
  • Chrome Android Not supported
  • Edge Not supported
  • Firefox Not supported
  • Firefox for Android Not supported
  • Safari Not supported Bugs: 227967
  • Safari on iOS Not supported Bugs: 227967

MDN documentation

Specifications

View as JSON | Edit this feature | Report an issue | Web-features entry: source, dist