[webkit-dev] Increasing the number of cross-platform/port expected results

Simon Fraser simon.fraser at apple.com
Tue Feb 23 08:34:18 PST 2010

On Feb 23, 2010, at 8:21 AM, Tor Arne Vestbø wrote:

> On 23/2/10 17:02 , Simon Fraser wrote:
>> On Feb 23, 2010, at 5:00 AM, Tor Arne Vestbø wrote:
>>> Hey all,
>>> A reoccurring problem when trying to maintain layout-test results
>>> is differences in font and theme metrics for tests that dump the
>>> render tree. Often a test does not actually test font
>>> loading/rendering or theming, but has a piece of text or an input
>>> element somewhere in the test which causes the metrics in the
>>> render tree to be different, and hence the test failing.
>> I think the correct longterm solution to this problem is to use
>> reftests. A reftest consists of two files; the test file, and a
>> "reference" file that should give the same on-screen rendering. When
>> the test is run, the browser loads both files, takes snapshots, and
>> does a pixel comparison. Thus font differences between platforms
>> become less of an issue.
> You mean for example that the reference file of a css-border test that has some header-text describing the test would contain the same header-text but then a image to represent the reference of the css-part?

It could be an image, or it could be a configuration of <div> elements, or a table, or something else that can be configured to look exactly the same as the CSS border property being tested.


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