unregister_block_style( string $block_name, string $block_style_name ): bool

User Contributed Notes

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   Marie Comet 4 years ago

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   The following code sample unregister the style named ‘fancy-quote’ from the core quote block:

   unregister_block_style( 'core/quote', 'fancy-quote' );

   Important: The function unregister_block_style only unregisters styles that were registered on the server using register_block_style. The function does not unregister a style registered using client-side code.
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   Jason Raveling 2 years ago

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   As Marie Comet mentioned, you cannot use unregister_block_style() on a style that was registered serverside (e.g. via PHP). The following PHP will not unregister a block style from the core/table block:

   // PHP
   unregister_block_style( 'core/table', 'stripes' );

   You can use the Block API via JavaScript to unregister it. Running the following JavaScript will successfully unregister the style.

   // JavaScript
   wp.blocks.unregisterBlockStyle( 'core/table', 'stripes' );

   For more info, look under Styles in the Block API Reference of the Block Editor Handbook.