fix(radiobuttongroup): accessibility

[guidari]

Closes #17753

Added a new prop called hideLegendText to hide the legendText visually, the <legend> still on the DOM to meet accessibility standards.

Testing / Reviewing

• Toggle the prop on the Playground
• Run IBM Accessibility Checker

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.41%. Comparing base (0810fa1) to head (88b8a50).
Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17885      +/-   ##
==========================================
+ Coverage   80.19%   80.41%   +0.22%     
==========================================
  Files         406      406              
  Lines       14041    14043       +2     
  Branches     4399     4348      -51     
==========================================
+ Hits        11260    11293      +33     
+ Misses       2614     2584      -30     
+ Partials      167      166       -1     

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[ariellalgilmore]

LGTM!

[tay1orjones]

Hey I'm curious why visually hide the legend vs. having the user put aria-label or aria-labelledby on the fieldset (via ...rest) when they don't want to use the legend?

The codebase has hideLabel all over the place, but it looks like all usages of legend are a hard binary of in the dom or not. When not in the DOM the user is expected to provide their own label by other means.

Is the legend itself still required or valuable in some way even when hidden?

[guidari]

Hey I'm curious why visually hide the legend vs. having the user put aria-label or aria-labelledby on the fieldset (via ...rest) when they don't want to use the legend?

The codebase has hideLabel all over the place, but it looks like all usages of legend are a hard binary of in the dom or not. When not in the DOM the user is expected to provide their own label by other means.

Is the legend itself still required or valuable in some way even when hidden?

Ohh, you are right.aria-label fixes the issue, and there is no need for this PR!