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layout: Disallow margins from collapsing through blocks with clearance
per CSS 2.1 § 8.3.1. Fixes the test failure in #10458.
This commit is contained in:
Patrick Walton
parent
e32455f7b8
commit
a3fd226341
37 changed files with 223 additions and 94 deletions
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@ -51,4 +51,4 @@
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<div class="class1"></div>
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</div>
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</body>
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</html>
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</html>
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@ -1,3 +0,0 @@
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[Flexible-order.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[adjacent-floats-001.htm]
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type: reftest
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expected: FAIL
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4
tests/wpt/metadata-css/css21_dev/html4/bidi-010b.htm.ini
Normal file
4
tests/wpt/metadata-css/css21_dev/html4/bidi-010b.htm.ini
Normal file
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@ -0,0 +1,4 @@
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[bidi-010b.htm]
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type: reftest
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disabled: intermittent failure on reference, starting from PR #10458
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@ -1,3 +0,0 @@
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[border-right-color-175.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[c414-flt-fit-002.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[c414-flt-fit-003.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[c414-flt-fit-004.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[c414-flt-fit-005.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[c414-flt-fit-006.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-002.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-float-004.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-float-005.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-float-006.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-float-007.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-float-008.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[clear-float-009.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[float-006.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[float-applies-to-009.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[float-applies-to-012.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[float-non-replaced-height-001.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[floats-003.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[floats-004.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[floats-123.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[floats-141.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[floats-144.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +1,3 @@
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[floats-145.htm]
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type: reftest
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expected: FAIL
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disabled: depends on unspecified line-height behavior, see PR #10458
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@ -1,3 +0,0 @@
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[floats-146.htm]
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type: reftest
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expected: FAIL
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@ -1,3 +0,0 @@
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[position-absolute-007.htm]
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type: reftest
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expected: FAIL
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@ -1571,6 +1571,30 @@
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"url": "/_mozilla/css/floated_table_with_margin_a.html"
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}
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],
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"css/floats_margin_collapse_a.html": [
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{
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"path": "css/floats_margin_collapse_a.html",
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"references": [
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[
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"/_mozilla/css/floats_margin_collapse_ref.html",
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"=="
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]
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],
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"url": "/_mozilla/css/floats_margin_collapse_a.html"
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}
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],
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"css/floats_margin_collapse_with_clearance_a.html": [
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{
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"path": "css/floats_margin_collapse_with_clearance_a.html",
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"references": [
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[
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"/_mozilla/css/floats_margin_collapse_with_clearance_ref.html",
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"=="
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]
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],
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"url": "/_mozilla/css/floats_margin_collapse_with_clearance_a.html"
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}
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],
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"css/focus_selector.html": [
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{
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"path": "css/focus_selector.html",
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@ -8161,6 +8185,30 @@
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"url": "/_mozilla/css/floated_table_with_margin_a.html"
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}
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],
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"css/floats_margin_collapse_a.html": [
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{
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"path": "css/floats_margin_collapse_a.html",
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"references": [
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[
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"/_mozilla/css/floats_margin_collapse_ref.html",
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"=="
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]
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],
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"url": "/_mozilla/css/floats_margin_collapse_a.html"
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}
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],
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"css/floats_margin_collapse_with_clearance_a.html": [
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{
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"path": "css/floats_margin_collapse_with_clearance_a.html",
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"references": [
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[
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"/_mozilla/css/floats_margin_collapse_with_clearance_ref.html",
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"=="
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]
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],
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"url": "/_mozilla/css/floats_margin_collapse_with_clearance_a.html"
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}
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],
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"css/focus_selector.html": [
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{
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"path": "css/focus_selector.html",
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42
tests/wpt/mozilla/tests/css/floats_margin_collapse_a.html
Normal file
42
tests/wpt/mozilla/tests/css/floats_margin_collapse_a.html
Normal file
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<!DOCTYPE html>
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<meta charset="utf-8">
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<link rel="match" href="floats_margin_collapse_ref.html">
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<!--
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From https://github.com/servo/servo/pull/10458:
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https://drafts.csswg.org/css2/visuren.html#float-rules
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A floating box's outer top may not be higher than the top of its containing block. When the float occurs between two collapsing margins, the float is positioned as if it had an otherwise empty anonymous block parent taking part in the flow. The position of such a parent is defined by the rules in the section on margin collapsing.
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#a is not "in the flow" since it’s a float, which makes #b the first in-flow child of <body>, which makes the top margins of <body> and #b "adjoining" (even if the former is zero) which makes them collapse.
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So the quoted rule applies and there’s an hypothetical block around #a. Since that blocks has no in-flow content, margins collapse through it.
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Then I believe this rule applies:
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https://drafts.csswg.org/css2/box.html#collapsed-through
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If the element's margins are collapsed with its parent's top margin, the top border edge of the box is defined to be the same as the parent's.
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The top border edge of <body> is below its top margin, which is collapsed with that of #b.
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-->
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<style>
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html, body {
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margin: 0;
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}
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div {
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width: 32px;
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height: 32px;
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}
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#a {
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float: left;
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background: green;
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}
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#b {
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background: blue;
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margin-top: 32px;
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}
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</style>
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<div id=a></div>
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<div id=b></div>
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19
tests/wpt/mozilla/tests/css/floats_margin_collapse_ref.html
Normal file
19
tests/wpt/mozilla/tests/css/floats_margin_collapse_ref.html
Normal file
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<!DOCTYPE html>
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<meta charset="utf-8">
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<style>
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html, body {
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margin: 0;
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}
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div {
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width: 32px;
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height: 32px;
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position: absolute;
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left: 0;
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}
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#a {
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top: 32px;
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background: green;
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}
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</style>
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<div id=a></div>
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@ -0,0 +1,45 @@
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<!DOCTYPE html>
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<meta charset="utf-8">
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<title></title>
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<link rel="match" href="floats_margin_collapse_with_clearance_ref.html">
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<!--
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From https://github.com/servo/servo/pull/10458:
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https://drafts.csswg.org/css2/visuren.html#float-rules
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A floating box's outer top may not be higher than the top of its containing block. When the float occurs between two collapsing margins, the float is positioned as if it had an otherwise empty anonymous block parent taking part in the flow. The position of such a parent is defined by the rules in the section on margin collapsing.
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#a is not "in the flow" since it’s a float, which makes #b the first in-flow child of <body>, which makes the top margins of <body> and #b "adjoining" (even if the former is zero) which makes them collapse.
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So the quoted rule applies and there’s an hypothetical block around #a. Since that blocks has no in-flow content, margins collapse through it.
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Then I believe this rule applies:
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https://drafts.csswg.org/css2/box.html#collapsed-through
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If the element's margins are collapsed with its parent's top margin, the top border edge of the box is defined to be the same as the parent's.
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The top border edge of <body> is below its top margin, which is collapsed with that of #b.
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-->
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<style>
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html, body {
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margin: 0;
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}
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div {
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width: 32px;
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height: 32px;
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}
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#a {
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float: left;
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background: green;
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}
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#b {
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background: blue;
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margin-top: 32px;
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clear: left;
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}
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</style>
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<div id=a></div>
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<div id=b></div>
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@ -0,0 +1,25 @@
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<!DOCTYPE html>
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<meta charset="utf-8">
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<style>
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html, body {
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margin: 0;
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}
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div {
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width: 32px;
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height: 32px;
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position: absolute;
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left: 0;
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}
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#a {
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background: green;
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top: 0;
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}
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#b {
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background: blue;
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top: 32px;
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}
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</style>
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<div id=a></div>
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<div id=b></div>
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