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Re: [css-fonts] Test for rem/em dimensions based on :root font-size

From: Philip Jägenstedt <foolip@google.com>
Date: Tue, 10 Sep 2019 11:08:29 +0200
Message-ID: <CAARdPYfkJh0QvY3Gj_Hi=yXHdAxGvM-yCyYFjgZTpnE6ujueEA@mail.gmail.com>
To: Jon Ronnenberg <jon.ronnenberg@gmail.com>
Cc: public-test-infra <public-test-infra@w3.org>
I've also tested percentage.html and still get the same behavior in Chrome
and Firefox.

On Tue, Sep 10, 2019 at 11:05 AM Philip Jägenstedt <foolip@google.com>

> Hi Jon,
> I see that https://crbug.com/308862 has a lot of stars, so this is
> probably an important issue to resolve. Thanks for pushing it!
> Tests for parts of the web platform not yet tested are always appreciated!
> You've already found our main documentation site
> https://web-platform-tests.org/ and the ambition is that this should be
> enough to get you through the process. However, the repo is a little
> daunting with a lot of open issues and PRs, so having someone who you can
> poke for reviews and help, well, helps.
> A reftest is probably the right tool for this if it depends on a fixed
> viewport width, as reftests are always run at 800x600. Given a page that
> results in different rendering in different browsers it should be fairly
> straightforward to turn it into a reftest.
> I tried rem-height.html from the bug, but it actually seems to give the
> same result in Chrome and Firefox on Linux. Can you provide screenshots of
> that or another test case showing the differences between browsers?
> On Sun, Sep 8, 2019 at 11:17 PM Jon Ronnenberg <jon.ronnenberg@gmail.com>
> wrote:
>> 6 years ago I filed a bug in
>> https://bugs.chromium.org/p/chromium/issues/detail?id=308862 and lately
>> it has been picked up by both Chromium developers and web developers.
>> The short description is that, using percentage value in :root{ font-size
>> }  below a certain threshold does not translate to correct rem/em values in
>> blink and webkit. It does work as advertised on w3, in Edge and Firefox. <
>> https://www.w3.org/TR/css-values-3/#rem
>> <https://www.w3..org/TR/css-values-3/#rem>>
>> I have look at the test cases in <
>> https://github.com/web-platform-tests/wpt/tree/master/css/css-values>
>> and searched in issues <
>> https://github.com/web-platform-tests/wpt/issues?utf8=%E2%9C%93&q=is%3Aissue+REM+font-size>
>> but have not found anything that suggest that there exist a test for this
>> issue.
>> Myself and others have provided several test cases in the chromium issue
>> < https://bugs.chromium.org/p/chromium/issues/detail?id=308862> and I am
>> wondering if it is feasible to translate a simple one of them into a test
>> in the web-platform-tests Project.
>> I don't have any experience writing these kind of tests and would need
>> help to get started. I imagine that it could be a reftest <
>> https://web-platform-tests.org/writing-tests/reftests.html> which could
>> be run automatically.
>> Is there interest in this kind of test, is it the right place for such a
>> test and how do I get started?
Received on Tuesday, 10 September 2019 09:09:04 UTC

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