bug(radio): extra padding when label is empty

[Schoko19961]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

Similar to checkboxes, the label in radio-buttons should be hidden when empty to avoid having the 4px padding of the label.
checkbox.scss

Maybe this could be added to internal-form-field.scss?

Reproduction

StackBlitz link: https://stackblitz.com/edit/components-issue-starter-xhypjnpx?file=src%2Fmain.ts,src%2Fglobal_styles.css,src%2Fmaterial-module.ts
Steps to reproduce:

1. Add/Remove: .mat-internal-form-field > label:empty { display: none; }

Expected Behavior

The <label> of mat-radio-button should not be displayed if empty, similar to how it's done with mat-checkbox

Actual Behavior

The label is displayed and therefore the mat-radio-button has a width of 44px (40px + 4px padding of the label)

Environment

• Angular: 19.2.4
• CDK/Material: 19.2.7
• Browser(s): all
• Operating System (e.g. Windows, macOS, Ubuntu): windows

[crisbeto]

Closing since radio buttons generally shouldn't be used without labels.

[Schoko19961]

Always provide an accessible label via aria-label or aria-labelledby for radio buttons without descriptive text content.

If the design differs from default angular-material (i.e. labels above / below the radio), the label is passed via aria-label and therefore the text-content is empty.

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