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Do you want to know how the CSS WG works? Fantasai has written about:csswg, An Inside View of the CSS Working Group at W3C.
resize: both
for textarea
user-select: none
proposed here that Florian was actioned to investigateuser-select: none
regarding its use in template-based editinguser-select
must not apply to ::first-line
or ::first-letter
sideways-left
, but the proposed options will go into the ED of Writing Modes with an invitation for input on a solution.