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5 changes: 3 additions & 2 deletions css-syntax-3/Overview.bs
Original file line number Diff line number Diff line change
Expand Up @@ -137,8 +137,9 @@ Description of CSS's Syntax</h2>
</div>

Property names and <a>at-rule</a> names are always <a>identifiers</a>,
which have to start with a letter or a hyphen followed by a letter,
and then can contain letters, numbers, hyphens, or underscores.
which have to start with an <a>identifier-start code point</a>, two hyphens,
or a hyphen followed by an identifier-start code point,
and then can contain zero or more <a>identifier code points</a>.
You can include any <a>code point</a> at all,
even ones that CSS uses in its syntax,
by <a>escaping</a> it.
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