List of steps to reproduce (step by step, including full links if applicable):

• Edit a css page which wgPageContentModel is sanitized-css
• replace content by follow content:

a {
	display: revert;
	color: revert;
}

What happens?:

• Invalid or unsupported value for property display at line 2 character 11.
• Invalid or unsupported value for property color at line 3 character 9.

What should have happened instead?:
mark "revert" as vaild value.

Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.:
TemplateStyles v1.0 (a0f32c4)