1448670 - Consider unprefixing ::-moz-selection for web compat

Status: RESOLVED DUPLICATE of bug 509958

(Core :: CSS Parsing and Computation, enhancement)

Description

[Florens Verschelde :fvsch]

While the spec (https://www.w3.org/TR/css-pseudo-4/#highlight-pseudos) is not finalized yet, many sites include ::selection styles which work for text color and background color in:

- IE9+
- Edge
- Chrome
- Safari

Firefox is the only holdout with support for a prefixed version only. While having it prefixed (or better, behind a flag) is the theoretical good approach, in practice it’s a web compat issue since ::selection is widely used on the Web, with two scenarios for Firefox:

1. ::-moz-selection is not included
2. ::-moz-selection is included but not updated, resulting in issues like hard to read or even *invisible* selections (Example: https://github.com/react-navigation/react-navigation.github.io/pull/41)

Would unprefixing ::-moz-selection as-is doable at all?
Cheers.

Comment 1

[Emilio Cobos Álvarez [:emilio]]

I suggested the same in bug 1427680. I'm happy to do it, though that is still waiting on input from dbaron.

Friendly reminder :)

Comment 2

[Florens Verschelde :fvsch]

Attachment: Site using text-shadow and removing it on ::selection but not on ::-moz-selection

This screenshot shows a common issue with the lack of ::selection support: sites that use text-shadow for visual effects (in this case for mimicking text-decoration-skip-ink:auto) will remove the text-shadow on ::selection but often don't duplicate this style specifically for Firefox.

Comment 3

[Florens Verschelde :fvsch]

Woops, looks like this is a duplicate of bug 509958.

Comment 4

[Emilio Cobos Álvarez [:emilio]]

That bug does have way more context. Thanks!