Version: Chrome: 61.0.3138.0
OS: Mac OS 10.9.5
Architecture: Intel

What steps will reproduce the problem?
0. Enable experimental web platform features flag in Chrome
1. Go to https://bakkot.github.io/test262-web-runner/
2. Click "remote"
3. Expand "language"
4. Next to "module-code", click "run"
5. Crash.

Alternatively, click "local" and supply the attached zip.

As far as I can tell this isn't caused by any specific test. There's no crash when all tests are run individually.

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This page is highly atypical - it's loading a lot of unusual modules in an unusual way. Specifically, it's rotating through 32 blank iframes, reseting the '.src' of each one, appending a normal, inline script, and then appending an inline module which may or may not have syntax errors. (Though I observe this even when only using one iframe.)

I've attached a zip which includes a substantially minimized reproduction - just the same module with syntax error 100 times. You can load it by clicking the 'local' button on the page.

I'm the developer of that project and and am happy to provide whatever help I can.
 

Deleted: test262-reduced.zip 21.0 KB

test262-reduced.zip 21.0 KB Download