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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1508420
+-->
+<head>
+ <meta charset="utf-8">
+ <title>
+ Test for Bug 1508420: Cases where a frame isn't allowed to be a dynamic
+ reflow root
+ </title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <script src="/tests/SimpleTest/WindowSnapshot.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body onload="main()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1508420">Mozilla Bug 1508420</a>
+<p id="display">
+ <!-- Here's the iframe that we'll do all of our testing/snapshotting in: -->
+ <iframe srcdoc="<!DOCTYPE html><body></body>"></iframe>
+</p>
+<script type="application/javascript">
+ /** Test for Bug 1508420 **/
+ /**
+ * This test exercises various cases where we exclude a frame from being
+ * flagged as a dynamic reflow root. (We prevent this because we know that
+ * there are cases where we'd produce incorrect layout if we initiated reflow
+ * from the frame in question.)
+ *
+ * Roughly, the idea in each subtest here is to do the following:
+ * 1) Set up a scenario with some condition that we think should prevent a
+ * particular frame from being flagged as a dynamic reflow root.
+ * 2) Make a dynamic tweak that we expect would result in broken layout, if
+ * we had allowed the frame in question to be a dynamic reflow root.
+ * Take a snapshot.
+ * 3) Force a full reconstruct + reflow of the document's frames (by
+ * toggling "display:none" on the root element). Take another snapshot.
+ * 4) Assert that snapshots look the same -- i.e. that our incremental
+ * reflow didn't produce the wrong layout.
+ *
+ * Ideally, every condition in ReflowInput::InitDynamicReflowRoot()
+ * should have a corresponding subtest here (and the subtest should fail if
+ * we remove the condition from InitDynamicReflowRoot).
+ */
+
+ // Styles that are sufficient to make a typical element into a reflow root.
+ // We apply these styles to "reflow root candidates" throughout this test
+ // (and then add other styles that should make the candidate ineligible,
+ // typically).
+ const gReflowRootCandidateStyles =
+ "display: flow-root; will-change: transform; width: 10px; height: 10px;";
+
+ // Some convenience globals for the document inside the iframe:
+ // (initialized in 'main' after the iframe gets a chance to load)
+ // --------------------------------------------------------------
+ let gFWindow;
+ let gFDoc;
+ let gFBody;
+
+ // Some utility functions used in each test function:
+ // --------------------------------------------------
+ function createStyledDiv(divStyleStr, divInnerText) {
+ let div = gFDoc.createElement("div");
+ div.style.cssText = divStyleStr;
+ if (typeof divInnerText !== "undefined") {
+ div.innerText = divInnerText;
+ }
+ return div;
+ }
+
+ // This function takes an initial snapshot, then a second snapshot after
+ // invoking the given tweakFunc, and finally a third after forcing the frame
+ // tree to be reconstructed from scratch. Then it compares the snapshots to
+ // validate that the tweak did produce a visible change, & that the
+ // after-tweak rendering looks the same in the last two snapshots.
+ function tweakAndCompareSnapshots(tweakFunc, descPrefix) {
+ let snapPreTweak = snapshotWindow(gFWindow, false);
+ let descPreTweak = descPrefix + "-initial-rendering";
+
+ // Now we invoke the tweak (changing the size of some content inside the
+ // reflow root candidate). If this influences the size of the candidate
+ // itself, and we fail to do any reflow outside of the candidate because
+ // we made it a reflow root, then we expect to end up with a broken layout
+ // due to a parent or sibling not having been resized/repositioned.
+ // We'll discover that when comparing snapIncReflow against snapFullReflow
+ // below.
+ tweakFunc();
+
+ let snapIncReflow = snapshotWindow(gFWindow, false);
+ let descIncReflow = descPrefix + "-after-tweak-inc-reflow";
+
+ // Now we trigger a "full" reflow (not incremental), by forcing
+ // frame reconstruction all the way from the body element. This should
+ // force us to reflow from the actual document root, even if we have
+ // promoted any frames to be dynamic reflow roots.
+ gFBody.style.display = "none";
+ gFBody.offsetTop; // flush layout
+ gFBody.style.display = "";
+ let snapFullReflow = snapshotWindow(gFWindow, false);
+ let descFullReflow = descPrefix + "-after-tweak-full-reflow";
+
+ assertSnapshots(snapIncReflow, snapPreTweak, false, null,
+ descIncReflow, descPreTweak);
+ assertSnapshots(snapIncReflow, snapFullReflow, true, null,
+ descIncReflow, descFullReflow);
+ }
+
+ // Test functions (called from "main"), with a subtest array in most cases:
+ // ------------------------------------------------------------------------
+
+ // Subtests for intrinsic size keywords (and equivalent, e.g. percentages) as
+ // values for width/height/{min,max}-{width,height} on reflow root candidates:
+ let intrinsicSizeSubtests = [
+ { desc: "width-auto",
+ candStyle: "width:auto",
+ },
+ { desc: "width-pct",
+ candStyle: "width:80%",
+ },
+ { desc: "width-calc-pct",
+ candStyle: "width:calc(10px + 80%)",
+ },
+ { desc: "width-min-content",
+ candStyle: "width:-moz-min-content; width:min-content;",
+ },
+ { desc: "width-max-content",
+ candStyle: "width:-moz-max-content; width:max-content;",
+ },
+ { desc: "min-width-min-content",
+ candStyle: "min-width:-moz-min-content; min-width:min-content;",
+ },
+ { desc: "min-width-max-content",
+ candStyle: "min-width:-moz-max-content; min-width:max-content;",
+ },
+ { desc: "max-width-min-content",
+ // Note: hardcoded 'width' here must be larger than what 'inner'
+ // gets resized to, so that max-width gets a chance to clamp.
+ candStyle: "width: 50px; \
+ max-width:-moz-min-content; max-width:min-content;",
+ },
+ { desc: "max-width-max-content",
+ candStyle: "width: 50px; \
+ max-width:-moz-max-content; max-width:max-content;",
+ },
+ { desc: "height-auto",
+ candStyle: "height:auto",
+ },
+ { desc: "height-pct",
+ candStyle: "height:80%",
+ },
+ { desc: "height-calc-pct",
+ candStyle: "height:calc(10px + 80%)",
+ },
+ { desc: "height-min-content",
+ candStyle: "height:-moz-min-content; height:min-content;",
+ },
+ { desc: "height-max-content",
+ candStyle: "height:-moz-max-content; height:max-content;",
+ },
+ { desc: "min-height-min-content",
+ candStyle: "min-height:-moz-min-content; min-height:min-content;",
+ },
+ { desc: "min-height-max-content",
+ candStyle: "min-height:-moz-max-content; min-height:max-content;",
+ },
+ { desc: "max-height-min-content",
+ // Note: hardcoded 'height' here must be larger than what 'inner'
+ // gets resized to, so that max-height gets a chance to clamp.
+ candStyle: "height: 50px; \
+ max-height:-moz-min-content; max-height:min-content;",
+ },
+ { desc: "max-height-max-content",
+ candStyle: "height: 50px; \
+ max-height:-moz-max-content; max-height:max-content;",
+ },
+ ];
+
+ // Intrinsic heights (e.g. 'height:auto') should prevent
+ // an element from being a reflow root.
+ function runIntrinsicSizeSubtest(subtest) {
+ // Run each testcase in horizontal & vertical writing mode:
+ for (let wmVal of ["horizontal-tb", "vertical-lr"]) {
+ gFBody.style.writingMode = wmVal;
+
+ // Short version of WM, for use in logging for snapshot comparison below:
+ let wmDesc = (wmVal == "horizontal-tb" ? "-horizWM" : "-vertWM");
+
+ // This outer div is intrinsically sized, and it needs to be reflowed
+ // when the size of its child (the reflow root candidate) changes.
+ let outer = createStyledDiv("border: 2px solid teal; \
+ inline-size: -moz-max-content; \
+ inline-size: max-content");
+ // The reflow root candidate:
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ subtest.candStyle);
+
+ // Something whose size we can adjust, inside the reflow root candidate:
+ let inner = createStyledDiv("height:20px; width:20px; \
+ border: 1px solid purple");
+
+ cand.appendChild(inner);
+ outer.appendChild(cand);
+ gFBody.appendChild(outer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc + wmDesc);
+
+ // clean up
+ outer.remove();
+ gFBody.style.writingMode = "";
+ }
+ }
+
+ let flexItemSubtests = [
+ { desc: "flex-basis-content",
+ candStyle: "flex-basis:content;",
+ },
+ { desc: "flex-basis-min-content",
+ candStyle: "flex-basis:-moz-min-content;flex-basis:min-content;",
+ },
+ { desc: "flex-basis-auto-width-auto",
+ candStyle: "flex-basis:auto;width:auto;",
+ },
+ // For percent flex-basis, we're concerned with cases where the percent
+ // triggers content-based sizing during the flex container's intrinsic
+ // sizing step. So we need to get the container to be intrinsically sized;
+ // hence the use of the (optional) "isContainerIntrinsicallySized" flag.
+// FIXME(bug 1548078): the following two tests fail to produce a rendering difference:
+// { desc: "flex-basis-pct",
+// candStyle: "flex-basis:80%;",
+// isContainerIntrinsicallySized: true,
+// },
+// { desc: "flex-basis-calc-pct",
+// candStyle: "flex-basis:calc(10px + 80%);",
+// isContainerIntrinsicallySized: true,
+// },
+ { desc: "flex-basis-from-pct-isize",
+ candStyle: "inline-size:80%",
+ isContainerIntrinsicallySized: true,
+ },
+ { desc: "flex-basis-from-calc-pct-isize",
+ candStyle: "inline-size:calc(10px + 80%);",
+ isContainerIntrinsicallySized: true,
+ },
+ // Testing the magic "min-main-size:auto" keyword
+ // and other intrinsic min/max sizes
+ { desc: "flex-min-inline-size-auto",
+ candStyle: "flex:0 5px; inline-size:auto; min-inline-size:auto",
+ },
+ { desc: "flex-min-inline-size-min-content",
+ candStyle: "flex:0 5px; inline-size:auto; min-inline-size:min-content",
+ },
+ { desc: "flex-min-block-size-auto",
+ candStyle: "flex:0 5px; block-size:auto; min-block-size:auto",
+ isContainerColumnOriented: true,
+ },
+ { desc: "flex-min-block-size-auto",
+ candStyle: "flex:0 5px; block-size:auto; min-block-size:min-content",
+ isContainerColumnOriented: true,
+ },
+ ];
+
+ // Content-dependent flex-basis values should prevent a flex item
+ // from being a reflow root.
+ function runFlexItemSubtest(subtest) {
+ // We create a flex container with two flex items:
+ // - a simple flex item that just absorbs all extra space
+ // - the reflow root candidate
+ let containerSizeVal = subtest.isContainerIntrinsicallySized ?
+ "max-content" : "100px";
+ let containerSizeDecl =
+ "inline-size: " + containerSizeVal + "; " +
+ "block-size: " + containerSizeVal + ";";
+ let containerFlexDirectionDecl = "flex-direction: " +
+ (subtest.isContainerColumnOriented ? "column" : "row") + ";"
+
+ let flexContainer = createStyledDiv("display: flex; \
+ border: 2px solid teal; " +
+ containerSizeDecl +
+ containerFlexDirectionDecl);
+
+ let simpleItem = createStyledDiv("border: 1px solid gray; \
+ background: yellow; \
+ min-inline-size: 10px; \
+ flex: 1");
+
+ // The reflow root candidate
+ // (Note that we use min-width:0/min-height:0 by default, but subtests
+ // might override that with other values in 'candStyle'.)
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ " min-width: 0; min-height: 0; " +
+ subtest.candStyle);
+
+ // Something whose size we can adjust, inside the reflow root candidate:
+ let inner = createStyledDiv("height:20px; width:20px");
+
+ cand.appendChild(inner);
+ flexContainer.appendChild(simpleItem);
+ flexContainer.appendChild(cand);
+ gFBody.appendChild(flexContainer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ flexContainer.remove(); // clean up
+ }
+
+ let gridItemSubtests = [
+ { desc: "grid-pct-inline-isize",
+ candStyle: "inline-size:80%",
+ isContainerIntrinsicallySized: true,
+ },
+ { desc: "grid-calc-pct-inline-isize",
+ candStyle: "inline-size:calc(10px + 80%);",
+ isContainerIntrinsicallySized: true,
+ },
+ { desc: "grid-min-inline-size-min-content",
+ candStyle: "min-inline-size:min-content",
+ },
+ ];
+
+ // 'auto' and intrinsic size keywords on some properties should prevent
+ // a grid item from becoming a reflow root.
+ function runGridItemSubtest(subtest) {
+ // We create a 4x4 grid container with two grid items:
+ // - a simple grid item that just absorbs all extra space
+ // - the reflow root candidate
+ let containerSizeVal = subtest.isContainerIntrinsicallySized ?
+ "max-content" : "100px";
+ let containerSizeDecl =
+ "inline-size: " + containerSizeVal + "; " +
+ "block-size: " + containerSizeVal + ";";
+ let containerGridDirectionDecl = "grid-auto-flow: " +
+ (subtest.isContainerColumnOriented ? "column" : "row") + ";"
+ let gridContainer = createStyledDiv("display: grid; \
+ grid: 1fr auto / 1fr auto; \
+ border: 2px solid teal; " +
+ containerSizeDecl +
+ containerGridDirectionDecl);
+
+ let simpleItem = createStyledDiv("border: 1px solid gray; \
+ background: yellow;");
+
+ // The reflow root candidate
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ "background: blue; " +
+ "grid-area:2/2; " +
+ "min-width: 10px; min-height: 10px; " +
+ subtest.candStyle);
+ // Something whose size we can adjust, inside the reflow root candidate:
+ let inner = createStyledDiv("height:20px; width:20px;");
+
+ cand.appendChild(inner);
+ gridContainer.appendChild(simpleItem);
+ gridContainer.appendChild(cand);
+ gFBody.appendChild(gridContainer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ gridContainer.remove(); // clean up
+ }
+
+ let gridContainerSubtests = [
+ { desc: "grid-column-start",
+ candStyle: "grid-column-start:2",
+ },
+ { desc: "grid-column-end",
+ candStyle: "grid-column-end:3",
+ },
+ { desc: "grid-row-start",
+ candStyle: "grid-row-start:2",
+ },
+ { desc: "grid-row-end",
+ candStyle: "grid-row-end:3",
+ },
+ ];
+
+ // Test that changes to grid item properties that affect grid container
+ // layout causes a grid container reflow when the item is a reflow root.
+ function runGridContainerSubtest(subtest) {
+ // We create a 4x4 grid container with one grid item:
+ // - a reflow root grid item that we'll tweak from
+ // the list above. By default it's placed at 1,1
+ // but after the tweak it should be placed elsewhere
+ let gridContainer = createStyledDiv("display: grid; \
+ width: 100px; \
+ height: 100px; \
+ grid: 1fr 10px / 1fr 10px; \
+ border: 2px solid teal");
+ // The reflow root candidate
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ "background: blue; " +
+ " min-width: 10px; min-height: 10px; ");
+
+ gridContainer.appendChild(cand);
+ gFBody.appendChild(gridContainer);
+
+ let tweakFunc = function() {
+ cand.style.cssText += "; " + subtest.candStyle;
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ gridContainer.remove(); // clean up
+ }
+
+ let gridSubgridSubtests = [
+ { desc: "subgrid",
+ candStyle: "grid: subgrid / subgrid",
+ },
+ { desc: "subgrid-rows",
+ candStyle: "grid: subgrid / 20px",
+ },
+ { desc: "subgrid-columns",
+ candStyle: "grid: 20px / subgrid",
+ },
+ ];
+
+ // Test that a subgrid is not a reflow root.
+ function runGridSubgridSubtest(subtest) {
+ // We create a 4x4 grid container a with one grid item:
+ // - a reflow root display:grid that we'll style as a subgrid from
+ // the list above. We place an item inside it that we'll tweak
+ // the size of, which should affect the outer grid track sizes.
+ let gridContainer = createStyledDiv("display: grid; \
+ width: 100px; \
+ height: 100px; \
+ grid: 1fr auto / 1fr auto; \
+ border: 2px solid teal");
+ // The reflow root candidate
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ "display: grid;" +
+ "grid-area: 2/2;" +
+ "background: blue;" +
+ "min-width: 10px; min-height: 10px;" +
+ subtest.candStyle);
+
+ // Something whose size we can adjust, inside the subgrid:
+ let inner = createStyledDiv("height:20px; width:20px;");
+
+ cand.appendChild(inner);
+ gridContainer.appendChild(cand);
+ gFBody.appendChild(gridContainer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ gridContainer.remove(); // clean up
+ }
+
+ let tableSubtests = [
+ { desc: "table",
+ /* Testing the default "display:table" styling that runTableTest uses: */
+ candStyle: "",
+ },
+ { desc: "inline-table",
+ candStyle: "display:inline-table;",
+ },
+ { desc: "table-caption",
+ candStyle: "display:table-caption;",
+ },
+ { desc: "table-cell",
+ candStyle: "display:table-cell;",
+ },
+ { desc: "table-column",
+ candStyle: "display:table-column;",
+ isColumn: true,
+ },
+ { desc: "table-column-group",
+ candStyle: "display:table-column-group;",
+ isColumn: true,
+ },
+ { desc: "table-row",
+ candStyle: "display:table-row;",
+ },
+ { desc: "table-row-group",
+ candStyle: "display:table-row-group;",
+ },
+ ];
+
+ function runTableSubtest(subtest) {
+ let outer = createStyledDiv("");
+ let shrinkWrapIB = createStyledDiv("display: inline-block; \
+ border: 2px solid teal");
+ let cand = createStyledDiv("display: table; \
+ width: 1px; height: 1px; \
+ will-change: transform; \
+ border: 1px solid purple;" +
+ subtest.candStyle);
+ let inner = createStyledDiv("display: block; \
+ width: 10px; height: 10px; \
+ background: pink;");
+ if (subtest.isColumn) {
+ // The candidate is a table-column / table-column-group, so
+ // the inner content that we tweak shouldn't be inside of it.
+ // Create an explicit table, separately, and put the candidate
+ // (the column/column-group) and the tweakable inner element
+ // both inside of that explicit table.
+ let table = createStyledDiv("display: table");
+ table.appendChild(inner);
+ table.appendChild(cand);
+ shrinkWrapIB.appendChild(table);
+ } else {
+ // The candidate is a table or some other table part
+ // that can hold content. Just put the tweakable inner
+ // element directly inside of it, and let anonymous table parts
+ // be generated as-needed.
+ cand.appendChild(inner);
+ shrinkWrapIB.appendChild(cand);
+ }
+
+ outer.appendChild(gFDoc.createTextNode("a"));
+ outer.appendChild(shrinkWrapIB);
+ gFBody.appendChild(outer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ outer.remove(); // clean up
+ }
+
+ let inlineSubtests = [
+ { desc: "inline",
+ candStyle: "display:inline",
+ },
+ ];
+ function runInlineSubtest(subtest) {
+ let outer = createStyledDiv("");
+ let shrinkWrapIB = createStyledDiv("display: inline-block; \
+ border: 2px solid teal");
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ subtest.candStyle);
+ let inner = createStyledDiv("display: inline-block; \
+ width: 20px; height: 20px; \
+ background: pink;");
+
+ cand.appendChild(inner);
+ shrinkWrapIB.appendChild(cand);
+ outer.appendChild(gFDoc.createTextNode("a"));
+ outer.appendChild(shrinkWrapIB);
+ gFBody.appendChild(outer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ outer.remove(); // clean up
+ }
+
+ let rubySubtests = [
+ { desc: "ruby",
+ candStyle: "display:ruby",
+ },
+ { desc: "ruby-base",
+ candStyle: "display:ruby-base",
+ },
+ { desc: "ruby-base-container",
+ candStyle: "display:ruby-base-container",
+ },
+ { desc: "ruby-text",
+ candStyle: "display:ruby-text",
+ },
+ { desc: "ruby-text-container",
+ candStyle: "display:ruby-text-container",
+ },
+ ];
+
+ function runRubySubtest(subtest) {
+ let outer = createStyledDiv("");
+ let shrinkWrapIB = createStyledDiv("display: inline-block; \
+ border: 2px solid teal");
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ subtest.candStyle);
+ let inner = createStyledDiv("display: inline-block; \
+ width: 20px; height: 20px; \
+ background: pink;");
+
+ cand.appendChild(inner);
+ shrinkWrapIB.appendChild(cand);
+ outer.appendChild(gFDoc.createTextNode("a"));
+ outer.appendChild(shrinkWrapIB);
+ gFBody.appendChild(outer);
+
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, subtest.desc);
+
+ outer.remove(); // clean up
+ }
+
+ function runFixedPosTest() {
+ // We reset the 'will-change' value on the candidate (overriding
+ // 'will-change:transform'), so that it won't be a fixed-pos CB. We also
+ // give the candidate some margins to shift it away from the origin, to
+ // make it visually clearer that its child's fixed-pos offsets are being
+ // resolved against the viewport rather than against the candidate div.
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ "will-change: initial; \
+ margin: 20px 0 0 30px; \
+ border: 2px solid black;");
+
+ let inner = createStyledDiv("height: 20px; width: 20px; \
+ background: pink;");
+ let fixedPos = createStyledDiv("position: fixed; \
+ width: 10px; height: 10px; \
+ background: gray;");
+
+ cand.appendChild(inner);
+ cand.appendChild(fixedPos);
+ gFBody.appendChild(cand);
+
+ // For our tweak, we'll adjust the size of "inner". This change impacts
+ // the position of the "fixedPos" placeholder (specifically, its static
+ // position), so this will require an incremental reflow that is rooted at
+ // the viewport (the containing block of "fixedPos") in order to produce
+ // the correct final layout. This is why "cand" isn't allowed to be a
+ // reflow root.
+ let tweakFunc = function() {
+ inner.style.width = inner.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, "fixed-pos");
+
+ cand.remove(); // clean up
+ }
+
+ function runMarginCollapseTest() {
+ let outer = createStyledDiv("background: lime");
+
+ // We use 'display:block' on the candidate (overriding 'display:flow-root')
+ // so that it won't be a block formatting context. (See usage/definition of
+ // NS_BLOCK_BFC_STATE_BITS in our c++ layout code.)
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ "display: block; \
+ background: purple;");
+ // We'll add border to this div in the "tweak" function, which will break
+ // the stack of margin collapsed divs.
+ let divWithEventualBorder = createStyledDiv("");
+ let divWithMargin = createStyledDiv("margin-top: 30px; \
+ width: 10px; height: 10px; \
+ background: pink;");
+
+ divWithEventualBorder.appendChild(divWithMargin);
+ cand.appendChild(divWithEventualBorder);
+ outer.appendChild(cand);
+ gFBody.appendChild(outer);
+
+ // For our tweak, we'll add a border around "divWithEventualBorder", which
+ // prevents the margin (on "divWithMargin") from collapsing all the way up
+ // to the outermost div wrapper (which it does, before the tweak).
+ // So: this tweak effectively moves the y-position towards 0, for all
+ // div wrappers outside the new border. This includes "outer", the parent
+ // of our reflow root candidate. So: if we mistakenly allow "cand" to be a
+ // reflow root, then we probably would neglect to adjust the position of
+ // "outer" when reacting to this tweak (and we'd catch that & report a
+ // test failure in our screenshot comparisons below).
+ let tweakFunc = function() {
+ divWithEventualBorder.style.border = "2px solid black";
+ };
+ tweakAndCompareSnapshots(tweakFunc, "margin-uncollapse");
+
+ outer.remove(); // clean up
+ }
+
+ function runFloatTest() {
+ let outer = createStyledDiv("");
+
+ // We use 'display:block' on the candidate (overriding 'display:flow-root')
+ // so that it won't be a block formatting context. (See usage/definition of
+ // NS_BLOCK_BFC_STATE_BITS in our c++ layout code.)
+ // This allows floats inside the candidate to affect the position of
+ // inline-level content outside of it.
+ let cand = createStyledDiv(gReflowRootCandidateStyles +
+ "display: block; \
+ border: 2px solid black;");
+ let floatChild = createStyledDiv("float: left; \
+ width: 60px; height: 60px; \
+ background: pink;");
+ let inlineBlock = createStyledDiv("display: inline-block; \
+ width: 80px; height: 80px; \
+ background: teal");
+ cand.appendChild(floatChild);
+ outer.appendChild(cand);
+ outer.appendChild(inlineBlock);
+ gFBody.appendChild(outer);
+
+ let tweakFunc = function() {
+ floatChild.style.width = floatChild.style.height = "40px";
+ };
+ tweakAndCompareSnapshots(tweakFunc, "float");
+
+ outer.remove(); // clean up
+ }
+
+ function main() {
+ SimpleTest.waitForExplicitFinish();
+
+ // Initialize our convenience aliases:
+ gFWindow = frames[0].window;
+ gFDoc = frames[0].document;
+ gFBody = frames[0].document.body;
+
+ for (let subtest of intrinsicSizeSubtests) {
+ runIntrinsicSizeSubtest(subtest);
+ }
+ for (let subtest of flexItemSubtests) {
+ runFlexItemSubtest(subtest);
+ }
+ for (let subtest of gridContainerSubtests) {
+ runGridContainerSubtest(subtest);
+ }
+ for (let subtest of gridSubgridSubtests) {
+ runGridSubgridSubtest(subtest);
+ }
+ for (let subtest of gridItemSubtests) {
+ runGridItemSubtest(subtest);
+ }
+ for (let subtest of tableSubtests) {
+ runTableSubtest(subtest);
+ }
+ for (let subtest of inlineSubtests) {
+ runInlineSubtest(subtest);
+ }
+ for (let subtest of rubySubtests) {
+ runRubySubtest(subtest);
+ }
+ runFixedPosTest();
+ runMarginCollapseTest();
+ runFloatTest();
+
+ SimpleTest.finish();
+ }
+</script>
+</body>
+</html>