Customized built-in elements
Limited availability
Customized built-in elements are HTML elements that extend built-in elements using the is attribute, to add new behaviors that you define.
To learn more, see
is at MDN.
Compatibility
- Chrome 67 Released on 2018-05-29
- Chrome Android 67 Released on 2018-05-31
- Edge 79 Released on 2020-01-15
- Firefox 63 Released on 2018-10-23
- Firefox for Android 63 Released on 2018-10-23
- Safari ❌ See webkit.org/b/182671
- Safari on iOS ❌ See webkit.org/b/182671
Baseline availability blocked since January 2020 by Safari (58 months)
Specifications
- HTML Standard (#customized-built-in-element), from HTML Workstream (WHATWG).