Allow abbr styling with tooltip, fixes #39026

[fulldecent]

Description

This allows the abbr element to retain styling if you are using tooltips.

The tooltips feature will remove the title attribute, so the original abbr[title] rule no longer applies.

Motivation & Context

Closes https://github.com/twbs/bootstrap/issues/39026

To allow the usage:

<abbr title="Bootstrap">BS</abbr> is awesome

and allow people to hover that text to show the full title.

Type of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Refactoring (non-breaking change)
• [ ] Breaking change (fix or feature that would change existing functionality)

Checklist

• [x] I have read the contributing guidelines
• [x] My code follows the code style of the project (using npm run lint)
• [ ] My change introduces changes to the documentation
• [ ] I have updated the documentation accordingly
• [ ] I have added tests to cover my changes
• [ ] All new and existing tests passed

Live previews

Here is the test case before this change.

https://stackblitz.com/edit/github-rpfnqj-hsmnpo?file=index.html

I need help to edit this to use the new built change after this PR.

• https://deploy-preview-41421--twbs-bootstrap.netlify.app/

Related issues

• https://github.com/twbs/bootstrap/issues/39026