Toolbar: Fix missing focus style on the home icon in mobile layouts

[shamimmoeen]

Trac ticket: https://core.trac.wordpress.org/ticket/65765

The home icon is drawn on .ab-item::before and has no nested .ab-icon span. In mobile layouts its resting colour is more specific than its focus colour, so focusing the link never changes the icon:

resting   #wpadminbar.mobile .quicklinks .ab-item:before   (1,3,1)
focus     #wpadminbar li .ab-item:focus:before             (1,2,2)

This adds a focus selector next to the existing .hover rule, at matching specificity (1,4,1).

Both files are needed. colors/_admin.scss generates the admin colour schemes. admin-bar.css handles the two cases that load no colour scheme file at all: the Fresh scheme, and the toolbar on the front end of the site.

Note

#wpadminbar only gets the mobile class when wp_is_mobile() returns true, so reproducing needs a device preset in DevTools or a real device — narrowing the browser window is not enough.

Screenshots

	Before	After
Admin
Front end

The front-end pair also shows the mechanism: site-name and site-editor draw their icons on .ab-item::before and gain a focus colour with the patch, while comments uses a nested .ab-icon and was already working.

Use of AI Tools

• AI assistance: Yes
• Tool(s): Claude Code
• Model(s): Claude Opus 5
• Used for: Investigating the CSS specificity conflict, verifying the behaviour across the admin colour schemes and the front-end toolbar, and drafting the commit message and this description. The final change was reduced, tested and confirmed by me.

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