Need to add tests for postMessage using the incumbent global's origin when the target origin is "/"

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
html, javascript
Domain
testing, web-dev

Research direction

Read WHATWG HTML pull request 1573 and inspect the existing webmessaging/postMessage_solidus_* tests first. Determine how the incumbent global and target origin "/" are represented in the test setup, then add coverage for the specified behavior and run the relevant web-platform-tests webmessaging tests.

Written by the indexing model from the issue text.

Description

type:missing-coverage webmessaging

Per https://github.com/whatwg/html/pull/1573

I took a quick look at the existing webmessaging/postMessage_solidus_* tests and they're not trivially adaptable to test this. In particular they were NOT already testing the existing spec about entry global (as opposed to other globals). :(

//cc @domenic

Dominant language
HTML
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Merged PRs (30d)
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