https://drafts.csswg.org/css-values-4/#custom-idents
The default keyword is reserved and is also not a valid <custom-ident>.
None of the following CSS properties should accept default:
- animation-name
- counter-increment
- counter-reset
- grid-template-columns
- grid-template-rows
Firefox rejects default for each of these.
Blink currently only rejects default for grid-template-columns and grid-template-rows.
http://jsfiddle.net/ericwilligers/sdhcyzv5/
We should deprecate and remove support for default in animation-name/counter-increment/counter-reset.
Comment 1 by ericwilligers@chromium.org
, Sep 10