Or `sub`, which itself can mean a lower level or position, plus it can be an abbreviation of **substitute** -- GitHub Notification of comment by Zhang-Junzhi Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/2143#issuecomment-399342209 using your GitHub accountReceived on Friday, 22 June 2018 07:01:14 UTC
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