[wp-trac] [WordPress Trac] #63922: FontSizePicker incorrectly measures units for selecting elements

[WordPress Trac]

#63922: FontSizePicker incorrectly measures units for selecting elements
---------------------------+-----------------------------
 Reporter:  blackstar1991  |      Owner:  (none)
     Type:  defect (bug)   |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  General        |    Version:  6.8.2
 Severity:  normal         |   Keywords:
  Focuses:                 |
---------------------------+-----------------------------
 I see that WordPress show incorrect information of units of
 [https://wordpress.github.io/gutenberg/?path=/docs/components-
 fontsizepicker--docs FontSizePicker] if user choose default to the labels
 'S / M / L / XL / XXL'.

 Example my component

 {{{
 <FontSizePicker
    __next40pxDefaultSize
    fontSizes={[
                {
                 name: 'Small',
                 size: 12,
                 slug: 'small'
                },
                {
                 name: 'Normal',
                 size: 16,
                 slug: 'normal'
                },
                {
                 name: 'Big',
                 size: 26,
                 slug: 'big'
                }
                ]}
 value={
         titleFontSize? parseFloat( titleFontSize ): undefined
 }
 onChange={ ( newSize ) => {
           if ( newSize === undefined ) {
                 setAttributes( {
                 titleFontSize: '16',
                 titleFontUnit: 'px',
          } );
                 return;
         }
 setAttributes( {
                 titleFontSize: String( newSize ),
                 titleFontUnit: 'px',
               } );
 } }
 withSlider />
 }}}

 I saw this. ->
 [[Image(https://i.ibb.co/mCPjTVYX/WP-BUG.jpg)]]

 This component does not correctly indicate the units of measurement when
 switching between different states. Ideally it should show the font size
 in "px" but in fact it displays the value in "rem", but writes that it is
 "px"

 [[Image(https://i.ibb.co/5ht7qK6x/elementor-test-Google-
 Chrome-2025-09-03-22-04-47.jpg)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/63922>
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