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Fix(deployment-id): prevent exception on old webkit - #94604

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mischnic merged 1 commit into
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kyamaz99:fix/dataset-delete-old-webkit
Aug 6, 2026
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Fix(deployment-id): prevent exception on old webkit#94604
mischnic merged 1 commit into
vercel:canaryfrom
kyamaz99:fix/dataset-delete-old-webkit

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@kyamaz99

@kyamaz99 kyamaz99 commented Jun 9, 2026

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What?

Start a next application after 16.2.0 in a safari 9 which is used in playstation 4.
The application will error with this message
TypeError: Unable to delete property

Why?

We narrow down the problem to this line

delete document.documentElement.dataset.dplId
in
packages/next/src/shared/lib/deployment-id.ts

It seems to be related of how webkit implemented dataset, as discussed in this thread

How?

replace
this line

delete document.documentElement.dataset.dplId;
with
document.documentElement.removeAttribute('data-dpl-id');

if data cannot be deleted , we can remove the attribute.
It should achieve the same with a different syntax

Fixes #94601

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Tests Passed

Commit: 133aa5b

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Stats from current PR

🔴 1 regression, 1 improvement

Metric Canary PR Change
Webpack Cold (First Request) 3.396s 3.520s 🔴 +124ms (+4%)
Webpack Build Time (cached) 26.008s 25.300s 🟢 708ms (-3%)
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📖 Metrics Glossary

Dev Server Metrics:

  • Listen = TCP port starts accepting connections
  • First Request = HTTP server returns successful response
  • Cold = Fresh build (no cache)
  • Warm = With cached build artifacts

Build Metrics:

  • Fresh = Clean build (no .next directory)
  • Cached = With existing .next directory

Change Thresholds:

  • Time: Changes < 50ms AND < 10%, OR < 2% are insignificant
  • Size: Changes < 1KB AND < 1% are insignificant
  • All other changes are flagged to catch regressions

⚡ Dev Server

Metric Canary PR Change
Cold (Listen) 813ms 813ms
Cold (Ready in log) 789ms 791ms
Cold (First Request) 1.303s 1.331s
Warm (Listen) 813ms 813ms
Warm (Ready in log) 785ms 783ms
Warm (First Request) 1.291s 1.275s
📦 Dev Server (Webpack) (Legacy)

📦 Dev Server (Webpack)

Metric Canary PR Change
Cold (Listen) 814ms 814ms
Cold (Ready in log) 797ms 810ms
Cold (First Request) 3.396s 3.520s 🔴 +124ms (+4%)
Warm (Listen) 814ms 812ms
Warm (Ready in log) 809ms 799ms
Warm (First Request) 3.456s 3.461s

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Metric Canary PR Change
Fresh Build 6.163s 6.130s
Cached Build 2.988s 2.995s
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📦 Production Builds (Webpack)

Metric Canary PR Change
Fresh Build 26.057s 25.997s
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📎 Tarball URL
https://vercel-packages.vercel.app/next/commits/133aa5b2c4923128fc75467574d866b6b5d0860a/next

Commit: 133aa5b

@kyamaz99
kyamaz99 force-pushed the fix/dataset-delete-old-webkit branch from 4d13e3f to b6d4f93 Compare June 26, 2026 15:46
@kyamaz99
kyamaz99 force-pushed the fix/dataset-delete-old-webkit branch from b6d4f93 to 133aa5b Compare August 6, 2026 07:46
@mischnic
mischnic merged commit b6d83ad into vercel:canary Aug 6, 2026
120 checks passed
@kyamaz99
kyamaz99 deleted the fix/dataset-delete-old-webkit branch August 6, 2026 12:46
m-kawafuji pushed a commit to m-kawafuji/next.js that referenced this pull request Aug 8, 2026
### What?

Start a next application after 16.2.0 in a safari 9 which is used in
playstation 4.
The application will error with this message
```TypeError:  Unable to delete property```

### Why?

We narrow down the problem to this line

```delete document.documentElement.dataset.dplId ```
in
 ```packages/next/src/shared/lib/deployment-id.ts ```

It seems to be related of how webkit implemented dataset, as discussed
in this
[thread](https://stackoverflow.com/questions/28973603/unable-to-delete-property-on-safari-when-trying-to-delete-dataset-attribute-in)

### How?
replace 
this line 

```   delete document.documentElement.dataset.dplId; ```
with
```   document.documentElement.removeAttribute('data-dpl-id');```

if data cannot be deleted , we can remove the attribute.
It should achieve the same with a different syntax

Fixes vercel#94601
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Unable to delete dlp-id on ol webkit

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