The 'marks' and 'text-decoration' properties each accept a set of enumerated values. These values can be specified in combination with each other. (e.g. "text-decoration: underline line-through") For 'text-decoration', we reject duplicate copies of the same enumerated value, but we aren't as strict for 'marks'. In bug 522320 comment 12, dbaron suggests that we make 'marks' reject duplicates, too. This bug is for that change. See CSSParserImpl::ParseTextDecoration and CSSParserImpl::ParseMarks for the relevant code.
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