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servo/components/script
bors-servo 7264592397 Auto merge of #13004 - jeenalee:combine-headers, r=jdm
Update DOM headers `append` and `delete`

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Two changes are included in this PR:
1. A resolved TODO comment in `delete` is removed.
2. `append` method adds a space after a comma when combining header values. Expected wpt results are updated with this change.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

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- [X] There are tests for these changes OR
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