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fix: Avoid Trusted Types violation when dangerouslySetInnerHTML is re… - #4935

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JoviDeCroock merged 2 commits into
preactjs:mainfrom
lukewarlow:fix-tt-violation
Jul 16, 2026
Merged

fix: Avoid Trusted Types violation when dangerouslySetInnerHTML is re…#4935
JoviDeCroock merged 2 commits into
preactjs:mainfrom
lukewarlow:fix-tt-violation

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@lukewarlow

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…moved

Setting innerHTML to an empty string violates Trusted Types. This changes to using textContent tp empty element children.

Fixes #4934

…moved

Setting innerHTML to an empty string violates Trusted Types.
This changes to using textContent tp empty element children.
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github-actions Bot commented Oct 24, 2025

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📊 Tachometer Benchmark Results

Summary

⏳ Benchmarks are currently running. Results below are out of date.

duration

  • create10k: unsure 🔍 -0% - +1% (-4.14ms - +5.31ms)
    preact-local vs preact-main
  • filter-list: unsure 🔍 -0% - +0% (-0.04ms - +0.03ms)
    preact-local vs preact-main
  • hydrate1k: unsure 🔍 -1% - +3% (-1.05ms - +2.53ms)
    preact-local vs preact-main
  • many-updates: slower ❌ 0% - 4% (0.08ms - 0.70ms)
    preact-local vs preact-main
  • replace1k: unsure 🔍 -2% - +1% (-1.57ms - +0.68ms)
    preact-local vs preact-main
  • text-update: unsure 🔍 -1% - +13% (-0.02ms - +0.26ms)
    preact-local vs preact-main
  • todo: unsure 🔍 -2% - +0% (-0.76ms - +0.14ms)
    preact-local vs preact-main
  • update10th1k: unsure 🔍 -5% - +2% (-1.27ms - +0.43ms)
    preact-local vs preact-main

usedJSHeapSize

  • create10k: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
    preact-local vs preact-main
  • filter-list: unsure 🔍 -0% - +0% (-0.01ms - +0.00ms)
    preact-local vs preact-main
  • hydrate1k: unsure 🔍 -1% - +12% (-0.07ms - +0.73ms)
    preact-local vs preact-main
  • many-updates: unsure 🔍 -0% - +0% (-0.01ms - +0.00ms)
    preact-local vs preact-main
  • replace1k: unsure 🔍 -0% - +0% (-0.00ms - +0.00ms)
    preact-local vs preact-main
  • text-update: unsure 🔍 -3% - +1% (-0.03ms - +0.01ms)
    preact-local vs preact-main
  • todo: unsure 🔍 +0% - +0% (+0.00ms - +0.00ms)
    preact-local vs preact-main
  • update10th1k: unsure 🔍 -0% - +0% (-0.01ms - +0.00ms)
    preact-local vs preact-main

Results

⏳ Benchmarks are currently running. Results below are out of date.
create10k

duration

VersionAvg timevs preact-localvs preact-main
preact-local964.06ms - 971.04ms-unsure 🔍
-0% - +1%
-4.14ms - +5.31ms
preact-main963.78ms - 970.15msunsure 🔍
-1% - +0%
-5.31ms - +4.14ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local19.04ms - 19.04ms-unsure 🔍
-0% - +0%
-0.00ms - +0.00ms
preact-main19.04ms - 19.04msunsure 🔍
-0% - +0%
-0.00ms - +0.00ms
-
filter-list

duration

VersionAvg timevs preact-localvs preact-main
preact-local16.54ms - 16.59ms-unsure 🔍
-0% - +0%
-0.04ms - +0.03ms
preact-main16.55ms - 16.60msunsure 🔍
-0% - +0%
-0.03ms - +0.04ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local1.54ms - 1.54ms-unsure 🔍
-0% - +0%
-0.01ms - +0.00ms
preact-main1.54ms - 1.54msunsure 🔍
-0% - +0%
-0.00ms - +0.01ms
-
hydrate1k

duration

VersionAvg timevs preact-localvs preact-main
preact-local78.25ms - 80.34ms-unsure 🔍
-1% - +3%
-1.05ms - +2.53ms
preact-main77.10ms - 80.00msunsure 🔍
-3% - +1%
-2.53ms - +1.05ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local6.23ms - 6.82ms-unsure 🔍
-1% - +12%
-0.07ms - +0.73ms
preact-main5.92ms - 6.46msunsure 🔍
-11% - +1%
-0.73ms - +0.07ms
-
many-updates

duration

VersionAvg timevs preact-localvs preact-main
preact-local16.20ms - 16.67ms-slower ❌
0% - 4%
0.08ms - 0.70ms
preact-main15.85ms - 16.24msfaster ✔
1% - 4%
0.08ms - 0.70ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local3.72ms - 3.73ms-unsure 🔍
-0% - +0%
-0.01ms - +0.00ms
preact-main3.72ms - 3.73msunsure 🔍
-0% - +0%
-0.00ms - +0.01ms
-
replace1k
  • Browser: chrome-headless
  • Sample size: 100
  • Built by: CI #5173
  • Commit: 41fc35e

duration

VersionAvg timevs preact-localvs preact-main
preact-local65.79ms - 67.29ms-unsure 🔍
-2% - +1%
-1.57ms - +0.68ms
preact-main66.15ms - 67.82msunsure 🔍
-1% - +2%
-0.68ms - +1.57ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local2.99ms - 2.99ms-unsure 🔍
-0% - +0%
-0.00ms - +0.00ms
preact-main2.99ms - 2.99msunsure 🔍
-0% - +0%
-0.00ms - +0.00ms
-

run-warmup-0

VersionAvg timevs preact-localvs preact-main
preact-local25.53ms - 26.31ms-unsure 🔍
-3% - +1%
-0.79ms - +0.34ms
preact-main25.74ms - 26.55msunsure 🔍
-1% - +3%
-0.34ms - +0.79ms
-

run-warmup-1

VersionAvg timevs preact-localvs preact-main
preact-local32.17ms - 33.10ms-unsure 🔍
-3% - +1%
-1.05ms - +0.29ms
preact-main32.54ms - 33.49msunsure 🔍
-1% - +3%
-0.29ms - +1.05ms
-

run-warmup-2

VersionAvg timevs preact-localvs preact-main
preact-local32.54ms - 33.33ms-unsure 🔍
-3% - +1%
-0.92ms - +0.25ms
preact-main32.84ms - 33.70msunsure 🔍
-1% - +3%
-0.25ms - +0.92ms
-

run-warmup-3

VersionAvg timevs preact-localvs preact-main
preact-local25.44ms - 25.84ms-unsure 🔍
-4% - +0%
-0.99ms - +0.11ms
preact-main25.56ms - 26.59msunsure 🔍
-0% - +4%
-0.11ms - +0.99ms
-

run-warmup-4

VersionAvg timevs preact-localvs preact-main
preact-local25.23ms - 26.87ms-unsure 🔍
-8% - +0%
-2.28ms - +0.09ms
preact-main26.29ms - 27.99msunsure 🔍
-0% - +9%
-0.09ms - +2.28ms
-

run-final

VersionAvg timevs preact-localvs preact-main
preact-local21.11ms - 21.64ms-unsure 🔍
-1% - +2%
-0.31ms - +0.43ms
preact-main21.05ms - 21.57msunsure 🔍
-2% - +1%
-0.43ms - +0.31ms
-
text-update
  • Browser: chrome-headless
  • Sample size: 240
  • Built by: CI #5173
  • Commit: 41fc35e

duration

VersionAvg timevs preact-localvs preact-main
preact-local2.04ms - 2.25ms-unsure 🔍
-1% - +13%
-0.02ms - +0.26ms
preact-main1.93ms - 2.12msunsure 🔍
-12% - +1%
-0.26ms - +0.02ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local0.99ms - 1.02ms-unsure 🔍
-3% - +1%
-0.03ms - +0.01ms
preact-main1.00ms - 1.03msunsure 🔍
-1% - +3%
-0.01ms - +0.03ms
-
todo

duration

VersionAvg timevs preact-localvs preact-main
preact-local30.79ms - 31.12ms-unsure 🔍
-2% - +0%
-0.76ms - +0.14ms
preact-main30.85ms - 31.68msunsure 🔍
-0% - +2%
-0.14ms - +0.76ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local1.25ms - 1.26ms-unsure 🔍
+0% - +0%
+0.00ms - +0.00ms
preact-main1.25ms - 1.25msunsure 🔍
-0% - -0%
-0.00ms - -0.00ms
-
update10th1k

duration

VersionAvg timevs preact-localvs preact-main
preact-local25.78ms - 26.93ms-unsure 🔍
-5% - +2%
-1.27ms - +0.43ms
preact-main26.15ms - 27.40msunsure 🔍
-2% - +5%
-0.43ms - +1.27ms
-

usedJSHeapSize

VersionAvg timevs preact-localvs preact-main
preact-local2.93ms - 2.94ms-unsure 🔍
-0% - +0%
-0.01ms - +0.00ms
preact-main2.94ms - 2.94msunsure 🔍
-0% - +0%
-0.00ms - +0.01ms
-

tachometer-reporter-action v2 for CI

@coveralls

coveralls commented Oct 24, 2025

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Coverage Status

coverage: 98.532%. remained the same — lukewarlow:fix-tt-violation into preactjs:main

@lukewarlow

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Contributor Author

No new test because tests such as 'should apply proper mutation for VNodes with dangerouslySetInnerHTML attr' already cover this (if you change the empty string to 'foo' for example it fails.

Comment thread src/diff/index.js
@JoviDeCroock
JoviDeCroock merged commit 46e83a1 into preactjs:main Jul 16, 2026
13 checks passed
@JoviDeCroock JoviDeCroock mentioned this pull request Aug 5, 2026
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Conditional dangerouslySetInnerHTML triggers Trusted Types violation

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