[css-content] Description about <content-replacement> doesn't match what implementations do for pseudo-elements #2657
Description
The spec currently says that <content-replacement> value should:
Makes the element or pseudo-element a replaced element, filled with the specified
<image>. Its normal contents are suppressed and do not generate boxes, as if they weredisplay: none.
And there is a note in <content-list> value mentioning:
If the value of
<content-list>is a single<image>, it must instead be interpreted as a<content-replacement>.
This doesn't match what content with a single url means in CSS 2, nor how it is implemented in browsers.
Given #2656, I would suggest that we make the single url mean <content-list> for pseudo-element, and <content-replacement> only for elements.
[ Edited by @dbaron to add some missing backticks in the second quoted section. ]