"Compatibility caseless" had been applied to usemap attribute matching. The specification was updated so that case-sensitive matching is applied. https://github.com/whatwg/html/commit/6acdb2122298d2bb7bb839c0a61b4e1f9b0f9bc9 A deprecation warning is printed to the console starting in Chrome 57.
Documentation
Specification
Status in Chromium
Removed (tracking bug) in:
- Chrome for desktop release 58
- Chrome for Android release 58
- Android WebView release 58
Consensus & Standardization
After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.
- Shipped/Shipping
- No signal
- Shipped/Shipping
- No signals
Owner
Search tags
HTML, Image map,Last updated on 2020-11-09