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[WebParagraph] Visual: Text doesn't animate smoothly #188321

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#191030
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[WebParagraph] Visual: Text doesn't animate smoothly#188321
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#191030
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Rusino
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P1High-priority issues at the top of the work lista: text inputEntering text in a text field or keyboard related problemsa: typographyText rendering, possibly libtxtengineflutter/engine related. See also e: labels.team-webOwned by Web platform teamtriaged-webTriaged by Web platform team

Description

@mdebbar
mdebbar
opened on Jun 22, 2026

During an animation, some letters keep jittering (maybe due to pixel snapping?). Open https://bouncing.web.app/?mode=webparagraph and notice the text keeps shifting slightly during animation.

This also happens in text fields when typing. While adding text to the end of the text field, existing text jitters on some keyboard strokes.

Activity

  1. mdebbar
    assigned
    Rusino
    on Jun 22, 2026
  2. mdebbar
    added
    a: text inputEntering text in a text field or keyboard related problems
    engineflutter/engine related. See also e: labels.
    on Jun 22, 2026
  3. mdebbar
    added the
    Bug
    issue type on Jun 22, 2026
  4. mdebbar
    added
    a: typographyText rendering, possibly libtxt
    P1High-priority issues at the top of the work list
    team-webOwned by Web platform team
    triaged-webTriaged by Web platform team
    on Jun 22, 2026
  5. mdebbar
    added a parent issue on Jun 22, 2026

  6. yjbanov commented on Jul 15, 2026

    @yjbanov
    yjbanov
    on Jul 15, 2026
    Contributor

    It's mostly visible in the unusual "W" which seems to overlap with another letter ("H" perhaps). Skwasm is also affected, not just WebParagraph:

    Image

  7. mdebbar commented on Aug 11, 2026

    @mdebbar
    mdebbar
    on Aug 11, 2026
    ContributorAuthor

    It's mostly visible in the unusual "W" which seems to overlap with another letter ("H" perhaps). Skwasm is also affected, not just WebParagraph:

    Image

    This one in particular is a bug in the app. The "W"/"H" thing is happening on all renderers.

  8. auto-submit
    closed this as completedin #191030on Aug 17, 2026
  9. pull
    added a commit that references this issue on Aug 17, 2026

    [web] Fix WebParagraph subpixel text stretching and letter jittering (f…

    6386b76

  10. github-actions commented on Aug 31, 2026

    @github-actions
    github-actionsBot
    on Aug 31, 2026 – with GitHub Actions

    This thread has been automatically locked since there has not been any recent activity after it was closed. If you are still experiencing a similar issue, please open a new bug, including the output of flutter doctor -v and a minimal reproduction of the issue.

  11. github-actions
    locked as resolved and limited conversation to collaborators on Aug 31, 2026
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P1High-priority issues at the top of the work lista: text inputEntering text in a text field or keyboard related problemsa: typographyText rendering, possibly libtxtengineflutter/engine related. See also e: labels.team-webOwned by Web platform teamtriaged-webTriaged by Web platform team

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