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Test Info:

<!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>