While that may be true, the usage in this thread was not quite in line with the adjective. It was meant more as a command.
Further, "obscure" under any definition is still a description of what is to be done (similar to "black") when a CSS tag could do any of these (black it out, blur it out) or anything else, too. Using a tag of "spoiler" is still a description of the text within the tags, allowing the CSS to do whatever the CSS wants and still make sense, which is what CSS was intended for.
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