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Status

This page documents the implementation status of various HTML and CSS features in Blitz.

CSS PropertiesHTML ElementsEventsWPT TestsWPT History

This page documents Blitz's scores on the "css" subsuite of the Web Platform Tests.

wpt / css / css-position

Score history
1 month3 months6 months1 year2 years4 yearsAll time
0%20%40%60%80%100%May 2025Jul 2025Sep 2025Nov 2025Jan 2026Mar 2026May 2026Jul 2026Sep 2026Nov 2026css/css-position

Data from commit:
b6ace6a

AreaInterop ScoreTestsTest %SubtestsSubtest %
Total50.00%(185/398)46.48%(1163/1830)63.55%
animations66.62%(0/9)0.00%(643/883)72.81%
parsing100.00%(22/22)100.00%(166/166)100.00%
sticky34.07%(36/116)31.03%(51/165)30.90%
overlay47.05%(8/17)47.05%(16/126)12.69%
static-position16.66%(6/36)16.66%(6/36)16.66%
crashtests94.44%(17/18)94.44%(17/18)94.44%
multicol0.00%(0/16)0.00%(0/16)0.00%
TestSubtestsSubtest %Status
absolute-pos-box-inside-fixed-pos-box-with-changing-height.html(1/1)100.00%PASS
backdrop-inherit-computed.html(0/4)0.00%FAIL
backdrop-inherit-rendered.html(1/1)100.00%PASS
backdrop-tree-abiding-slotted.html(0/1)0.00%FAIL
backdrop-ua-style.html(0/1)0.00%FAIL
block-axis-constraint-changes-for-out-of-flow-box.html(1/1)100.00%PASS
box-insets-top-right-bottom-left.html(8/8)100.00%PASS
change-insets-inside-strict-containment-nested.html(1/1)100.00%PASS
containing-block-change-button.html(0/1)0.00%FAIL
containing-block-change-scrollframe.html(1/1)100.00%PASS
fixed-z-index-blend.html(1/1)100.00%PASS
hypothetical-box-scroll-parent.html(1/1)100.00%PASS
hypothetical-box-scroll-viewport.html(1/1)100.00%PASS
hypothetical-dynamic-change-001.html(1/1)100.00%PASS
hypothetical-dynamic-change-002.html(1/1)100.00%PASS
hypothetical-dynamic-change-003.html(1/1)100.00%PASS
inheritance.html(12/12)100.00%PASS
invalidate-opacity-negative-z-index.html(1/1)100.00%PASS
nested-inline-abspos-child-with-siblings.html(1/1)100.00%PASS
nested-inline-abspos-child.html(1/1)100.00%PASS
nested-positions-crash.html(1/1)100.00%PASS
out-of-flow-in-inline-content-intrinsic-size-001.html(15/17)88.23%FAIL
position-absolute-abspos-table-dynamic.html(1/1)100.00%PASS
position-absolute-center-001.html(1/1)100.00%PASS
position-absolute-center-002.html(1/1)100.00%PASS
position-absolute-center-003.html(1/1)100.00%PASS
position-absolute-center-004.html(1/1)100.00%PASS
position-absolute-center-006.html(0/1)0.00%FAIL
position-absolute-center-007.html(0/1)0.00%FAIL
position-absolute-chrome-bug-001.html(1/1)100.00%PASS
position-absolute-chrome-bug-002.html(1/1)100.00%PASS
position-absolute-container-dynamic-002.html(1/1)100.00%PASS
position-absolute-container-dynamic.html(1/1)100.00%PASS
position-absolute-crash-chrome-001.html(1/1)100.00%PASS
position-absolute-crash-chrome-002.html(1/1)100.00%PASS
position-absolute-crash-chrome-003.html(1/1)100.00%PASS
position-absolute-crash-chrome-004.html(1/1)100.00%PASS
position-absolute-crash-chrome-005.html(0/1)0.00%SKIP
position-absolute-crash-chrome-006.html(1/1)100.00%PASS
position-absolute-crash-chrome-007.html(1/1)100.00%PASS
position-absolute-crash-chrome-008.html(1/1)100.00%PASS
position-absolute-crash-chrome-009.html(1/1)100.00%PASS
position-absolute-crash-chrome-010.html(1/1)100.00%PASS
position-absolute-crash-chrome-011.html(2/2)100.00%PASS
position-absolute-crash-chrome-012.html(1/1)100.00%PASS
position-absolute-crash-chrome-013.html(1/1)100.00%PASS
position-absolute-dynamic-auto-overflow.html(1/1)100.00%PASS
position-absolute-dynamic-containing-block.html(8/8)100.00%PASS
position-absolute-dynamic-formatting-context.html(12/12)100.00%PASS
position-absolute-dynamic-list-marker.html(1/1)100.00%PASS
position-absolute-dynamic-margin-auto-001.html(2/2)100.00%PASS
position-absolute-dynamic-overflow-001.html(1/1)100.00%PASS
position-absolute-dynamic-overflow-002.html(1/1)100.00%PASS
position-absolute-dynamic-relayout-001.html(1/1)100.00%PASS
position-absolute-dynamic-relayout-002.html(1/1)100.00%PASS
position-absolute-dynamic-relayout-003.html(1/1)100.00%PASS
position-absolute-dynamic-relayout-004.html(0/1)0.00%FAIL
position-absolute-dynamic-relayout-005.html(0/1)0.00%FAIL
position-absolute-dynamic-relayout-006.html(0/1)0.00%FAIL
position-absolute-dynamic-relayout-007.html(1/1)100.00%PASS
position-absolute-dynamic-static-position-flex.html(1/1)100.00%PASS
position-absolute-dynamic-static-position-floats-001.html(0/1)0.00%FAIL
position-absolute-dynamic-static-position-floats-002.html(0/1)0.00%FAIL
position-absolute-dynamic-static-position-floats-003.html(0/1)0.00%FAIL
position-absolute-dynamic-static-position-floats-004.html(0/1)0.00%FAIL
position-absolute-dynamic-static-position-inline.html(1/1)100.00%PASS
position-absolute-dynamic-static-position-margin-001.html(1/1)100.00%PASS
position-absolute-dynamic-static-position-margin-002.html(1/1)100.00%PASS
position-absolute-dynamic-static-position-table-cell.html(1/1)100.00%PASS
position-absolute-dynamic-static-position.html(1/1)100.00%PASS
position-absolute-fieldset.html(1/1)100.00%PASS
position-absolute-fit-content-auto-margin.html(30/45)66.66%FAIL
position-absolute-fit-content.html(0/1)0.00%FAIL
position-absolute-iframe-print-001.sub.html(0/1)0.00%FAIL
position-absolute-iframe-print-002.sub.html(0/1)0.00%FAIL
position-absolute-in-inline-001.html(1/1)100.00%PASS
position-absolute-in-inline-002.html(0/1)0.00%FAIL
position-absolute-in-inline-003.html(0/1)0.00%FAIL
position-absolute-in-inline-004.html(0/1)0.00%FAIL
position-absolute-in-inline-005.html(0/1)0.00%FAIL
position-absolute-in-inline-006.html(0/1)0.00%FAIL
position-absolute-in-inline-007a.html(0/1)0.00%FAIL
position-absolute-in-inline-007b.html(0/1)0.00%FAIL
position-absolute-in-inline-008a.html(0/1)0.00%FAIL
position-absolute-in-inline-008b.html(0/1)0.00%FAIL
position-absolute-in-inline-009.html(0/1)0.00%FAIL
position-absolute-in-inline-010.html(0/1)0.00%FAIL
position-absolute-in-inline-011.html(0/1)0.00%FAIL
position-absolute-in-inline-012.html(0/1)0.00%FAIL
position-absolute-in-inline-crash.html(1/1)100.00%PASS
position-absolute-in-inline-dynamic.html(0/9)0.00%MISSING
position-absolute-in-inline-margin-top.html(1/1)100.00%PASS
position-absolute-in-inline-vertical-lr.html(0/16)0.00%MISSING
position-absolute-large-negative-inset.html(1/1)100.00%PASS
position-absolute-margin-auto-001.html(1/1)100.00%PASS
position-absolute-multicol-001.html(1/1)100.00%PASS
position-absolute-padding-percentage.html(2/2)100.00%PASS
position-absolute-percentage-height.html(2/2)100.00%PASS
position-absolute-replaced-intrinsic-size.tentative.html(1/1)100.00%PASS
position-absolute-replaced-minmax.html(0/43)0.00%SKIP
position-absolute-replaced-no-intrinsic-size.tentative.html(1/1)100.00%PASS
position-absolute-replaced-with-display-table.html(1/1)100.00%PASS
position-absolute-root-element-flex.html(1/1)100.00%PASS
position-absolute-root-element-grid.html(1/1)100.00%PASS
position-absolute-scrollable-overflow-001.html(14/14)100.00%PASS
position-absolute-scrollable-overflow-zero.html(1/1)100.00%PASS
position-absolute-semi-replaced-stretch-button.html(1/1)100.00%PASS
position-absolute-semi-replaced-stretch-input.html(1/1)100.00%PASS
position-absolute-semi-replaced-stretch-other.html(1/1)100.00%PASS
position-absolute-table-001.html(3/6)50.00%FAIL
position-absolute-under-non-containing-stacking-context.html(0/1)0.00%FAIL
position-absolute-with-negative-sized-imcb.html(28/30)93.33%FAIL
position-change.html(1/1)100.00%PASS
position-fixed-at-bottom-right-on-viewport.html(1/1)100.00%PASS
position-fixed-dynamic-transformed-sibling.html(1/1)100.00%PASS
position-fixed-overflow-print.html(1/1)100.00%PASS
position-fixed-root-element-flex.html(1/1)100.00%PASS
position-fixed-root-element-grid.html(1/1)100.00%PASS
position-fixed-scroll-nested-fixed.html(1/1)100.00%PASS
position-fixed-scroll-overlap.html(1/1)100.00%PASS
position-fixed-video-controls-print.html(1/1)100.00%PASS
position-relative-001.html(1/1)100.00%PASS
position-relative-002.html(0/1)0.00%FAIL
position-relative-003.html(1/1)100.00%PASS
position-relative-004.html(1/1)100.00%PASS
position-relative-005.html(1/1)100.00%PASS
position-relative-006.html(1/1)100.00%PASS
position-relative-007.html(1/1)100.00%PASS
position-relative-008.html(1/1)100.00%PASS
position-relative-009.html(1/1)100.00%PASS
position-relative-010.html(0/1)0.00%FAIL
position-relative-011.html(0/1)0.00%FAIL
position-relative-012.html(0/1)0.00%FAIL
position-relative-013.html(0/1)0.00%FAIL
position-relative-014.html(1/1)100.00%PASS
position-relative-015.html(20/20)100.00%PASS
position-relative-016.html(15/18)83.33%FAIL
position-relative-aspect-ratio-001.html(4/4)100.00%PASS
position-relative-aspect-ratio-002.html(2/3)66.66%FAIL
position-relative-empty-inline.html(0/1)0.00%FAIL
position-relative-table-caption.html(0/1)0.00%FAIL
position-relative-table-tbody-left-absolute-child.html(0/1)0.00%FAIL
position-relative-table-tbody-left.html(0/1)0.00%FAIL
position-relative-table-tbody-top-absolute-child.html(0/1)0.00%FAIL
position-relative-table-tbody-top.html(0/1)0.00%FAIL
position-relative-table-td-left.html(0/1)0.00%FAIL
position-relative-table-td-top.html(0/1)0.00%FAIL
position-relative-table-tfoot-left-absolute-child.html(0/1)0.00%FAIL
position-relative-table-tfoot-left.html(0/1)0.00%FAIL
position-relative-table-tfoot-top-absolute-child.html(0/1)0.00%FAIL
position-relative-table-tfoot-top.html(0/1)0.00%FAIL
position-relative-table-thead-left-absolute-child.html(0/1)0.00%FAIL
position-relative-table-thead-left.html(0/1)0.00%FAIL
position-relative-table-thead-top-absolute-child.html(0/1)0.00%FAIL
position-relative-table-thead-top.html(0/1)0.00%FAIL
position-relative-table-tr-left-absolute-child.html(0/1)0.00%FAIL
position-relative-table-tr-left.html(0/1)0.00%FAIL
position-relative-table-tr-top-absolute-child.html(0/1)0.00%FAIL
position-relative-table-tr-top.html(0/1)0.00%FAIL
position-static-001.html(1/1)100.00%PASS
position-sticky-dynamic-ancestor-001.html(0/1)0.00%FAIL
replaced-object-backdrop.html(0/1)0.00%FAIL
sticky-dialog.html(0/1)0.00%FAIL
z-index-blend-will-change-overlapping-layers.html(1/1)100.00%PASS