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Consider the CSS Custom Highlight API #21

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johnfactotum opened this issue Apr 19, 2024 · 0 comments
Open

Consider the CSS Custom Highlight API #21

johnfactotum opened this issue Apr 19, 2024 · 0 comments
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enhancement New feature or request

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@johnfactotum
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https://developer.mozilla.org/en-US/docs/Web/API/CSS_Custom_Highlight_API

It can replace foliate-js's overlayer. But there are a couple of drawbacks:

  • The properties that can be used are the same as those of ::selection. So basically only color and background color. Supposedly text-decoration should also work, but not in WebKit and Firefox yet, it seems.
  • Overlapping highlights can't be overlaid. Only one style will win, depending on the priority.
  • Not supported in Firefox yet, though implementation seems to be in progress in Nightly.

It's probably a good fit for search highlighting. Less so for annotations, at least not until text-decoration is supported.
@johnfactotum johnfactotum added the enhancement New feature or request label Apr 23, 2024
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