1766846 - .NET Editor text is not highlighted when using system High Contrast Theme at docs.microsoft.com

Status: NEW

(Web Compatibility :: Site Reports, defect, P3)

Description

[Raul Bucata]

Environment:
Operating system: Windows 10 x64 PRO
Firefox version: :Firefox Nightly 101.0a1 (2022-04-27) (64-bit)

Preconditions:
Set the High Contrast option to ON from Windows (shortcut: Left Alt+Left Shift+PrintScreen)

Steps to reproduce:

1. Navigate to: https://docs.microsoft.com/en-us/learn/modules/csharp-write-first/2-exercise-hello-world.
2. Input text into the .NET editor located in the right-hand side.
3. Highlight the text from the editor (select with mouse or CTRL+A).
4. Observe the result.

Expected behavior:
The text is highlighted.

Actual behavior:
The text is not highlighted.

Notes:

1. Reproducible regardless of the status of ETP.
2. Reproducible on the latest build of Firefox Nightly.
3. Works as expected using Edge.
4. Reproducible on other pages with a built-in .NET editor

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The severity field for this bug is set to S3. However, the accessibility severity is higher, [access-s2].
:dholbert, could you consider increasing the severity?

For more information, please visit auto_nag documentation.

Comment 2

[Emilio Cobos Álvarez (:emilio)]

This is not a Gecko bug. It works in edge because:

@media screen and (-ms-high-contrast: active) {
  .monaco-editor.vs .selected-text, .monaco-editor.vs-dark .selected-text {
    background-color: highlight !important;
  }
}

If they used (forced-colors: active) instead, it'd work. It doesn't work in Chrome either.

So, we could:

• Support -ms-high-contrast as an alias of forced-colors.
• Close this bug as INVALID.
• Move to the webcompat component and contact Microsoft to get their editor updated to use forced-colors instead of -ms-high-contrast.

Given Chrome doesn't support -ms-high-contrast either, I don't think we should do (1)...

Comment 3

[Ksenia Berezina [:ksenia]]

Leaving a ni for myself to send an email to our mailing list.