[webkit-dev] Experimental and (new) Internal feature flags

Ryosuke Niwa rniwa at webkit.org
Wed Sep 12 15:50:59 PDT 2018

On Wed, Sep 12, 2018 at 3:09 PM Dean Jackson <dino at apple.com> wrote:

> On 13 Sep 2018, at 08:05, Ali Juma <ajuma at chromium.org> wrote:
> Is there a plan for how to handle web platform tests (where we can't add
> such a header)?
> Currently, WebKitTestRunner enables all experimental features in tests
> (including those disabled by default), so adding an experimental feature
> (even one that's disabled by default) is a convenient way to get web
> platform test coverage for the feature. If WebKitTestRunner will no longer
> do that, we'll need some other way to keep these tests running.
> I thought about this. I see three options:
> 1. Continue to enable all experimental features in testing. The downside
> is that we're testing something different to what we ship.
> 2. Have the default value only apply to testing, not to shipping. For
> Internal Features, instead of enabling them all, I had them revert to their
> default value.
> 3. Have some way to add the headers after importing the WPT test.
> For now, I added headers to the WPT code, because there already were a
> bunch of tests that had such headers.

Is that automated? We don't want get into a state where we'd have to
manually add those headers whenever we re-import tests.

- R. Niwa
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