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diff --git a/layout/reftests/css-parsing/two-dash-identifiers.html b/layout/reftests/css-parsing/two-dash-identifiers.html
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+<!DOCTYPE html>
+<style>
+ .ok { color: red; }
+ #-- { color: green; }
+ #-foo { color: green }
+ #--foo { color: green; }
+ .-- { color: green; }
+ .-foo { color: green; }
+ .--foo { color: green; }
+
+ .fail { color: green; }
+ #- { color: red; }
+ .- { color: red; }
+</style>
+<div class="ok" id="--">This should be green.</div>
+<div class="ok" id="-foo">This should be green.</div>
+<div class="ok" id="--foo">This should be green.</div>
+<div class="ok --">This should be green.</div>
+<div class="ok -foo">This should be green.</div>
+<div class="ok --foo">This should be green.</div>
+<div class="fail" id="-">This should be green.</div>
+<div class="fail -">This should be green.</div>