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@t-hamano t-hamano commented Oct 23, 2025

Closes #72611

What?

Add overflow-x: auto to the Math block to prevent the formula from overflowing the content.

Why?

Otherwise, the whole page will show horizontal scrolling.

How?

In the save function, the math element is used as a block wrapper. However, in Firefox, I found that overflow scrolling doesn't work on math elements.

Furthermore, for markup consistency with the editor, I'll add a div wrapper to the save function.

Testing Instructions

  • Insert a Math block.
  • Add a formula by using the following code:
    ∑_{i = 1}^{N} d_{i}^{Y N} \ln ⁡ \left(Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{1}}{σ}\right) - Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)\right) + d_{i}^{Y Y} \ln ⁡ \left(Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)\right) + d_{i}^{N Y} \ln ⁡ \left(Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right) - Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)\right) + d_{i}^{N N} l n \left(1 - Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)\right)
    
  • Confirm the block on the frontend.

Screenshots or screencast

image

@t-hamano t-hamano self-assigned this Oct 23, 2025
@t-hamano t-hamano added [Type] Bug An existing feature does not function as intended Browser Issues Issues or PRs that are related to browser specific problems [Block] Math labels Oct 23, 2025
@github-project-automation github-project-automation bot moved this to 🔎 Needs Review in WordPress 6.9 Editor Tasks Oct 23, 2025
@t-hamano t-hamano marked this pull request as ready for review October 23, 2025 13:15
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The following accounts have interacted with this PR and/or linked issues. I will continue to update these lists as activity occurs. You can also manually ask me to refresh this list by adding the props-bot label.

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Unlinked contributors: EldarAgalarov.

Co-authored-by: t-hamano <[email protected]>
Co-authored-by: ellatrix <[email protected]>
Co-authored-by: wprashed <[email protected]>

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Size Change: +238 B (+0.01%)

Total Size: 2.19 MB

Filename Size Change
build/scripts/block-library/index.min.js 266 kB +89 B (+0.03%)
build/styles/block-library/style-rtl.css 15.6 kB +13 B (+0.08%)
build/styles/block-library/style.css 15.6 kB +14 B (+0.09%)
build/styles/block-library/math/style-rtl.css 61 B +61 B (new file) 🆕
build/styles/block-library/math/style.css 61 B +61 B (new file) 🆕
ℹ️ View Unchanged
Filename Size
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compressed-size-action

@ellatrix
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Hm, not great that we already need to deprecate the first version. Wy doesn't it automatically break, is this normal?

@t-hamano
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From what I've researched, I don't think auto-line-break is possible with native MathML.

@EldarAgalarov
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EldarAgalarov commented Oct 24, 2025

@ellatrix @t-hamano Line breaks seem to work. There are discussion Overall, overflow-x is not a responsive-friendly solution.

@t-hamano
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@EldarAgalarov Thank you for looking into this in detail. Ideally, the text would automatically wrap based on the container width, but that's not supported yet, is it?

By the way, I realized that manual line breaks are possible in the current Math block.

\begin{aligned}
\sum_{i = 1}^{N} \Bigg[
& d_{i}^{Y N} 
    \ln \left(
        Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{1}}{σ}\right)
        - Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)
    \right) \\
&+ d_{i}^{Y Y} 
    \ln \left(
        Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)
    \right) \\
&+ d_{i}^{N Y} 
    \ln \left(
        Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{1}}{σ}\right)
        - Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)
    \right) \\
&+ d_{i}^{N N} 
    \ln \left(
        1 - Φ \left(Z^{'}_{i} \frac{β}{σ} - \frac{t^{2}}{σ}\right)
    \right)
\Bigg]
\end{aligned}
image

We may need to discuss whether to let the user decide the line break positions, and whether any default line breaking or overflow handling is necessary.

@ellatrix
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What do we do for inline math (rich text format)?

@t-hamano
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One of the purposes of this pull request is to ensure consistency between the editor and the front-end markup, so let's merge it for now. If many users consider automatic scrolling unnecessary, we can remove that CSS later.

@t-hamano t-hamano added the Backport to WP 6.9 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta label Oct 29, 2025
@t-hamano t-hamano merged commit e74d6f3 into trunk Oct 29, 2025
42 checks passed
@t-hamano t-hamano deleted the math/scroll-horizontally branch October 29, 2025 07:47
@github-project-automation github-project-automation bot moved this from 🔎 Needs Review to ✅ Done in WordPress 6.9 Editor Tasks Oct 29, 2025
@github-actions github-actions bot added this to the Gutenberg 22.0 milestone Oct 29, 2025
@github-actions github-actions bot removed the Backport to WP 6.9 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta label Oct 29, 2025
gutenbergplugin pushed a commit that referenced this pull request Oct 29, 2025
* Math: Enable horizontal auto-scrolling

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Unlinked contributors: EldarAgalarov.

Co-authored-by: t-hamano <[email protected]>
Co-authored-by: ellatrix <[email protected]>
Co-authored-by: wprashed <[email protected]>
@github-actions github-actions bot added the Backported to WP Core Pull request that has been successfully merged into WP Core label Oct 29, 2025
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I just cherry-picked this PR to the wp/6.9 branch to get it included in the next release: 235619e

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Backported to WP Core Pull request that has been successfully merged into WP Core [Block] Math Browser Issues Issues or PRs that are related to browser specific problems [Type] Bug An existing feature does not function as intended

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Math Block: overflowing with long formulas

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