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Update web-platform-tests to revision 3503c50a6452e153bde906a9c6644cb6237224fc

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WPT Sync Bot 2019-11-30 08:24:23 +00:00
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tests/wpt/web-platform-tests/docs/writing-tests/reftests.md
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@ -96,16 +96,31 @@ leaf nodes.)
## Controlling When Comparison Occurs
By default reftest screenshots are taken after the `load` event has
fired, and web fonts (if any) are loaded. In some cases it is
necessary to delay the screenshot later than this, for example because
some DOM manipulation is required to set up the desired test
conditions. To enable this, the test may have a `class="reftest-wait"`
attribute specified on the root element. This will cause the
screenshot to be delayed until the `load` event has fired and the
`reftest-wait` class has been removed from the root element. Note that
in neither case is exact timing of the screenshot guaranteed: it is
only guaranteed to be after those events.
By default, reftest screenshots are taken after the following
conditions are met:
* The `load` event has fired
* Web fonts (if any) are loaded
* Pending paints have completed
In some cases it is necessary to delay the screenshot later than this,
for example because some DOM manipulation is required to set up the
desired test conditions. To enable this, the test may have a
`class="reftest-wait"` attribute specified on the root element. In
this case the harness will run the following sequence of steps:
* Wait for the `load` event to fire and fonts to load.
* Wait for pending paints to complete.
* Fire an event named `TestRendered` at the root element, with the
`bubbles` attribute set to true.
* Wait for the `reftest-wait` class to be removed from the root
element.
* Wait for pending paints to complete.
* Screenshot the viewport.
The `TestRendered` event provides a hook for tests to make
modifications to the test document that are not batched into the
initial layout/paint.
## Fuzzy Matching