https://drafts.csswg.org/css-pseudo-4/#highlight-styling says that highlight pseudos can take the caret-color and cursor properties, but https://drafts.csswg.org/css-pseudo-4/#highlight-painting doesn't say how they're rendered.
Possibilities:
- the topmost one wins
- the topmost non auto wins
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https://drafts.csswg.org/css-pseudo-4/#highlight-styling says that highlight pseudos can take the caret-color and cursor properties, but https://drafts.csswg.org/css-pseudo-4/#highlight-painting doesn't say how they're rendered.
Possibilities: