With APZ enabled, these tests activate scrollframes (by scrolling them) in the
test pages but not the reference pages. This causes differences in layerization
which causes reftests to fail by a few pixel differences in the scrollbars. By
making the scrollboxes will-change:scroll-position both the test and reference
pages have activated scrollframes, and so the layerization is the same in both.
With APZ, we always layerize the first scrollable element of the page,
if the page itself is not scrollable. These additional layers can cause
fuzzy reftest failures in two ways: differences in blending, and by
disabling sub-pixel test anti-aliasing. The latter is only a problem
with unaccelerated drawing, because we don't support component alpha
layers with BasicLayers. (We also don't support them with
BasicCompositor, but "Reftest unaccelerated" only tests BasicLayers).
- scroll-behavior-8.html - Tests if dynamically changing the scroll-behavior
css property on a div element takes effect after the page has been painted and
reflowed.
- scroll-behavior-9.html - Tests if dynamically changing the scroll-behavior
on the body element takes effect after the page has been painted and
reflowed.
- scroll-behavior-8.html - Tests if dynamically changing the scroll-behavior
css property on a div element takes effect after the page has been painted and
reflowed.
- scroll-behavior-9.html - Tests if dynamically changing the scroll-behavior
on the body element takes effect after the page has been painted and
reflowed.
- Updated smooth scroll behavior mochitest and reftests to
match new CSSOM-View DOM scrolling method parameters.
- Added tests for Element.ScrollBy and Element.ScrollTo.
scroll-behavior-5.html - Element.ScrollLeft and Element.ScrollTop scroll-behavior tests
- Set Element.ScrollLeft and Element.ScrollTop, for <div> tag with
no 'scroll-behavior' attribute. Expected to be instantaneous.
- Set Element.ScrollLeft and Element.ScrollTop, for <div> tag with
'scroll-behavior: auto'. Expected to be instantaneous.
- Set Element.ScrollLeft and Element.ScrollTop, for <div> tag with
'scroll-behavior: instant'. Expected to be instantaneous.
- Set Element.ScrollLeft and Element.ScrollTop, for <div> tag with
'scroll-behavior: smooth'. Expected to be smooth.
scroll-behavior-4.html - Anchor Link Scrolling
- Navigate to Anchor, for <div> tag with no ‘scroll-behavior’ attribute.
Expected to be instantaneous.
- Navigate to Anchor, for <div> tag with ‘scroll-behavior: auto’.
Expected to be instantaneous.
- Navigate to Anchor, for <div> tag with ‘scroll-behavior: instant’.
Expected to be instantaneous.
- Navigate to Anchor, for <div> tag with ‘scroll-behavior: smooth’.
Expected to be smooth.
scroll-behavior-1.html - Viewport Scrolling, expected to be smooth:
- DOM Method not specifying scroll-behavior, for <body> tag with 'scroll-behavior: smooth’
scroll-behavior-2.html - Div Scrolling, expected to be smooth:
- DOM Method not specifying scroll-behavior, for <div> tag with 'scroll-behavior: smooth’
- DOM Method specifying ‘auto’ scroll-behavior, for <div> tag with ‘scroll-behavior: smooth’
- DOM Method specifying 'smooth’ scroll-behavior, for <div> tag with ‘scroll-behavior: smooth’
- DOM Method specifying ‘smooth’ scroll-behavior, for <div> tag with ‘scroll-behavior: instant’
- DOM Method specifying ‘smooth’ scroll-behavior, for <div> tag with ‘scroll-behavior: auto’
- DOM Method specifying ‘smooth’ scroll-behavior, for <div> tag with no scroll-behavior attribute.
scroll-behavior-3.html - Div Scrolling, expected to be instant:
- DOM Method not specifying scroll-behavior, for <div> tag with ‘scroll-behavior: instant’
- DOM Method not specifying scroll-behavior, for <div> tag with ‘scroll-behavior: auto’
- DOM Method not specifying scroll-behavior, for <div> tag with no scroll-behavior attribute.
- DOM Method specifying ‘instant’ scroll-behavior, for <div> tag with ‘scroll-behavior: smooth’
- DOM Method specifying ‘instant’ scroll-behavior, for <div> tag with ‘scroll-behavior: instant’
- DOM Method specifying ‘instant’ scroll-behavior, for <div> tag with ‘scroll-behavior: auto’
- DOM Method specifying ‘instant’ scroll-behavior, for <div> tag with no scroll-behavior attribute.
- DOM Method specifying ‘auto’ scroll-behavior, for <div> tag with ‘scroll-behavior: instant’
- DOM Method specifying ‘auto’ scroll-behavior, for <div> tag with ‘scroll-behavior: auto’
- DOM Method specifying ‘auto’ scroll-behavior, for <div> tag with no scroll-behavior attribute.
