Deprecate and Remove case-insensitive matching for usemap attribute

Category: DOM
Type: New or changed feature
Status: Removed (Chrome 58)
Intent stage: None

Summary

"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.

Standards & signals

Specification: https://html.spec.whatwg.org/multipage/infrastructure.html#rules-for-parsing-a-hash-name-reference
Firefox: Shipped/Shipping
Safari: Shipped/Shipping
Web developers: No signals
Tracking bug: http://crbug.com/659464

Docs: https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img

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