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Details Block: remove overflow:hidden style #60270

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merged 1 commit into from
Apr 4, 2024

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t-hamano
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Fixes #60269

What?

This PR removes the overflow: hidden applied to the Details block. This will eliminate the unnatural outline when the summary element is focused, as reported in #60269.

This is a screenshot in TT4.

Summary element is focused

Before After
image image

When content is open

Before After
image image

Why?

To avoid cutting off the focus outline. Especially when the focus style is customized, like in Twenty Twenty-Four, the focus outline can disappear completely or the outline of certain sides can disappear.

How?

I simply deleted overflow: hidden. As far as I've tested, this doesn't cause any problems. I also looked into #45055 and #49808 and couldn't find any reason why this style was explicitly applied either.

Testing Instructions for Keyboard

  • Insert a Details block and save the post.
  • Use the tab key on the front end to focus the summary element.
  • Press enter to see the focus style when the content is opened.
  • Check out focus outlines in various themes.

@t-hamano t-hamano added [Type] Bug An existing feature does not function as intended [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Block] Details Affects the Details Block - used to display content which can be shown/hidden labels Mar 28, 2024
@t-hamano t-hamano self-assigned this Mar 28, 2024
@t-hamano t-hamano marked this pull request as ready for review March 28, 2024 07:23
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Co-authored-by: carolinan <poena@git.wordpress.org>
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Size Change: -18 B (0%)

Total Size: 1.72 MB

Filename Size Change
build/block-library/blocks/details/style-rtl.css 86 B -12 B (-12%) 👏
build/block-library/blocks/details/style.css 86 B -12 B (-12%) 👏
build/block-library/style-rtl.css 14.8 kB +3 B (0%)
build/block-library/style.css 14.8 kB +3 B (0%)
ℹ️ View Unchanged
Filename Size
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compressed-size-action

@sabernhardt
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Thanks for opening the issue and creating a PR!

The overflow was originally hidden to "fix background clipping":
90f5249

If hiding the overflow is necessary, I can think of a few other possibilities to try.

  1. Move overflow: hidden to the child elements (I do not know how this affects a background).
.wp-block-details > * {
  overflow: hidden;
}
  1. Use a negative outline offset.
.wp-block-details summary {
  outline-offset: -2px;
}
  1. Use small margins and padding to try keeping the summary focus inside the details element (my least favorite option).
.wp-block-details {
  padding-top: 2px;
}
.wp-block-details summary {
  margin: 2px;
}

@t-hamano
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The overflow was originally hidden to "fix background clipping":

Thank you for finding that! That commit appears to be part of #45055, where the first Details block was added.

When this block was first added, it was divided into three blocks: Details, Details Summary and Details Content. My understanding is that the overflow: hidden style was probably added to prevent the background color from overflowing in the following scenario:

  • Apply border-radius style to the Details block.
  • Apply background color to the Details Summary or the Details Content blocks.

So it looks like the style is meant to solve the problem shown in the screenshot in this comment.

However, the current Details block is a single block and cannot have a background color applied to the Summary element or Content, so this issue should not occur.

In fact, the same problem can be reproduced if we delete overflow: hidden and insert a block with a background color in the inner block. However, this is not limited to the Details block, but can also be reproduced with a group block, for example.

image

Therefore, in #49808, when the Details block was merged into one, it seems that radius support was removed to avoid causing this problem, at least in the Details block.

Taking these into account, it seems safe to remove overflow:hidden since the Details block does not support radius itself.

@carolinan Are there any concerns about removing this style?

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I made a quick manual test with different settings and browsers and I don't see any regressions. I think the summary above is accurate.

@t-hamano
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t-hamano commented Apr 4, 2024

@carolinan Thanks for the review!

@sabernhardt I would like to merge this PR as I don't think it is necessary to hide the overflow in the current implementation.

@t-hamano t-hamano merged commit 98e55e0 into trunk Apr 4, 2024
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@t-hamano t-hamano deleted the details/remove-overflow-hidden branch April 4, 2024 09:26
@github-actions github-actions bot added this to the Gutenberg 18.2 milestone Apr 4, 2024
@abhisin
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abhisin commented Apr 4, 2024

in which directory and file i have to do these changes, please provide the path. iam facing the same problem rectangualr box around links or any clickable element, including detail block

@t-hamano
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t-hamano commented Apr 5, 2024

@abhisin Hi,

Could you please tell me more details? This PR about the Details block itself has already been merged, so it should automatically ship to future WordPress major versions. If what you want to solve is not limited to the Details block, it might be better to open a new issue.

cbravobernal pushed a commit to garridinsi/gutenberg that referenced this pull request Apr 9, 2024
Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: carolinan <poena@git.wordpress.org>
Co-authored-by: sabernhardt <sabernhardt@git.wordpress.org>
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Labels
[Block] Details Affects the Details Block - used to display content which can be shown/hidden [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Type] Bug An existing feature does not function as intended
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Details Block: The outline is cut off when focusing on the summary element
4 participants