Intent to Deprecate and Remove: the composite attribute on <img>

[Philip Jägenstedt]

Primary eng (and PM) emails

phi...@opera.com

Summary

Remove the composite attribute, which can be used on <img> to change the blend mode.

Motivation

This was added for Apple's Dashboard in 2004:

http://trac.webkit.org/changeset/6491

It's non-standard and fortunately it doesn't seem like Web developers have noticed. I found it only because I was curious what this "composite" thing in HTMLAttributeNames.in was.

Compatibility Risk

Virtually none. It affects rendering, but it isn't actually used, so...

Alternative implementation suggestion for web developers

Not drop-in replacements, but:

http://caniuse.com/#feat=canvas-blending

http://caniuse.com/#feat=css-backgroundblendmode

Usage information from UseCounter

https://www.chromestatus.com/metrics/feature/timeline/popularity/516

This is in M38, and hasn't registered at all. Zero.

Entry on chromestatus.com, crbug.com, or MDN

None.

Requesting approval to remove too?

Yes.

[Dimitri Glazkov]

LGTM.

:DG<

[Chris Harrelson]

LGTM

LGTM.

:DG<

To unsubscribe from this group and stop receiving emails from it, send an email to blink-dev+...@chromium.org.

[Philip Rogers]

LGTM

[Noel Gordon]

https://code.google.com/p/chromium/issues/detail?id=428636

[Dirk Schulze]

On Oct 29, 2014, at 10:54 PM, Philip Jägenstedt <phi...@opera.com> wrote:

> Alternative implementation suggestion for web developers
> Not drop-in replacements, but:
> http://caniuse.com/#feat=canvas-blending
> http://caniuse.com/#feat=css-backgroundblendmode

The actual alternative will be mix-blend-mode http://dev.w3.org/fxtf/compositing-1/#mix-blend-mode

It is implemented behind a flag.

Greetings
Dirk