Add Caps lock message to login screen

[nikunj8866]

Trac ticket: https://core.trac.wordpress.org/ticket/48345

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

[github-actions]

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Props nikunj8866, joedolson, sirlouen, westonruter, praful2111.

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[nikunj8866]

The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

Unlinked Accounts

The following contributors have not linked their GitHub and WordPress.org accounts: @nhatkar@updraftplus.com.

Contributors, please read how to link your accounts to ensure your work is properly credited in WordPress releases.

To understand the WordPress project's expectations around crediting contributors, please review the Contributor Attribution page in the Core Handbook.

Please use @nikunj8866 WordPress profile.

[nikunj8866]

After

[github-actions]

Test using WordPress Playground

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Test this pull request with WordPress Playground.

[joedolson]

There are some style things I'd like to see changed for consistency with color palette, an accessibility issue, and the browser detection needs some work.

[joedolson]

Getting closer!

[praful2111]

Tested with the below config

Test Report

Description

This report validates whether the indicated patch works as expected.

Patch tested: (#8726)

Environment

• WordPress: 6.9-alpha-20250922.141940
• PHP: 7.4.31-dev
• Server: PHP.wasm
• Database: WP_SQLite_Driver (Server: 5.5 / Client: 3.40.1)
• Browser: Chrome 141.0.0.0
• OS: Linux
• Theme: Twenty Twenty-Five 1.3
• MU Plugins: None activated
• Plugins:
  • Test Reports 1.2.0

Actual Results

1. ✅ Issue resolved with patch.

Additional Notes

• Any additional details worth mentioning.

Supplemental Artifacts

Chrome

Comet

Firefox

User Profile

obsolete

Completed

[joedolson]

Screenshots:

[joedolson]

Closed in r60988