Missing helper for Dimensions block support serialization (getDimensionsClassesAndStyles)

[mrleemon]

Description

Gutenberg currently exposes helper functions in @wordpress/block-editor to generate CSS classes and inline styles for several block supports when their serialization is intentionally skipped, for example:

__experimentalGetBorderClassesAndStyles
__experimentalGetColorClassesAndStyles
__experimentalGetShadowClassesAndStyles
__experimentalGetSpacingClassesAndStyles
getTypographyClassesAndStyles

These helpers are very useful in blocks where color, border, spacing, shadow or typography support is not serialized on the wrapper element, but the corresponding classes/styles still need to be generated and applied to inner elements.

However, there does not seem to be an equivalent helper for Dimensions block support (e.g. width / min-height / aspect-ratio where applicable). There is no:

__experimentalGetDimensionsClassesAndStyles

Problem

When a block opts out of dimensions support serialization, there is currently no official utility to retrieve the generated classes/styles for dimensions in the same way as the other supports. This makes handling dimensions inconsistent compared to color, spacing, border, shadow, and typography, and often requires re-implementing logic that core already handles internally.

Expected behavior

Provide an experimental helper similar to the others, for example:

__experimentalGetDimensionsClassesAndStyles

that returns { className, style } for the dimensions block support, allowing developers to apply those values to inner elements when needed.

Why this matters

• Improves consistency across block support APIs
• Reduces duplication of internal logic in custom blocks
• Makes advanced block layouts easier to implement correctly

[Swoyamjeetcodes]

Hi @mrleemon,

I’d like to work on this issue. I plan to add an experimental helper for Dimensions block support serialization (similar to the existing helpers for color, spacing, border, shadow, and typography), returning { className, style } so it can be reused when serialization is skipped.

I’ll follow existing patterns in @wordpress/block-editor and keep the API consistent with the other __experimentalGet*ClassesAndStyles helpers.

[Swoyamjeetcodes]

I’ve opened a PR that implements __experimentalGetDimensionsClassesAndStyles and adds unit tests covering the expected behavior.

This PR should close this issue:
PR: #74524

Thanks!