Should we explicitly add scientific notation to the CSS 2.1 grammar?

We have a default policy of no new features in CSS 2.1 errata, so shall we continue with that, or, shall we make an exception for scientific notation for numbers for re-use by SVG?

This addition would either need to be made explicitly, or indirectly by normatively referencing the CSS3 Syntax Module (which is believed to more accurately reflect implementations) as an update to the CSS 2.1 Grammar.

cc: @gsnedders
Related to issue #2224
Labels: css2, Agenda+ F2F