Igor Minar 55748dbc55 fix(core): allow css custom variables/properties in the style sanitizer (#33841)
This change enables "var(--my-var)" to pass through the style sanitizer.

After consulation with our security team, allowing these doesn't create
new attack vectors, so the sanitizer doesn't need to strip them.

Fixes parts of #23485 related to the sanitizer, other use cases discussed
there related to binding have been addressed via other changes to the
class and style handling in the runtime.

Closes #23485

PR Close #33841
2019-11-20 14:47:59 -08:00
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