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GeezerVison is showing github.com — CSS contrast and inconsistencies in Tachyon flamegraph · Issue #142363 · python/cpython

CSS contrast and inconsistencies in Tachyon flamegraph #142363

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CSS contrast and inconsistencies in Tachyon flamegraph#142363
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savannahostrowski
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3.15bugs and security fixesbugs and security fixesstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-profilingtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@savannahostrowski
savannahostrowski
opened on Dec 6, 2025
Issue body actions

Bug report

Playing around with Tachyon, I noticed that the coldest color in the flamegraph while in dark mode has insufficient contrast.

Image

Additionally, light and dark mode currently have different gradients for cool → colder → coldest. Dark mode goes darker blue = colder, but light mode has it reversed.

Light mode

Image

Dark mode

Image

Linked PRs

  • GH-142363: Contrast and gradient CSS fixes for Tachyon flamegraph #142364
  • gh-142363: Improve Tachyon flamegraph contrast #142377

Activity

  1. savannahostrowski
    self-assigned this
    on Dec 6, 2025
  2. savannahostrowski
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory
    3.15bugs and security fixesbugs and security fixes
    on Dec 6, 2025
  3. savannahostrowski
    added a commit that references this issue on Dec 6, 2025

    GH-142363: Contrast and gradient CSS fixes for Tachyon flamegraph (#1…

    332da62
  4. StanFromIreland
    added
    topic-profiling
    on Dec 7, 2025

  5. StanFromIreland commented on Dec 7, 2025

    @StanFromIreland
    StanFromIreland
    on Dec 7, 2025
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    Triage: Can this be closed?

  6. hugovk commented on Dec 7, 2025

    @hugovk
    hugovk
    on Dec 7, 2025
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    Lighthouse finds a few other contrast things, I'll open a PR.

    Image
    Reacted by Stan Ulbrych
    Reacted by Savannah Ostrowski

  7. hugovk commented on Dec 7, 2025

    @hugovk
    hugovk
    on Dec 7, 2025
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    #142377

  8. pablogsal
    added a commit that references this issue on Dec 8, 2025

    gh-142363: Improve Tachyon flamegraph contrast (#142377)

    3fa1425
  9. pablogsal
    closed this as completedon Dec 8, 2025

  10. pablogsal commented on Dec 8, 2025

    @pablogsal
    pablogsal
    on Dec 8, 2025
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    Thanks @hugovk and @savannahostrowski

    Reacted by Hugo van Kemenade
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  • @savannahostrowski
    savannahostrowski

Labels

3.15bugs and security fixesbugs and security fixesstdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directorytopic-profilingtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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