зеркало из https://github.com/mozilla/gecko-dev.git
214 строки
7.7 KiB
HTML
214 строки
7.7 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<body>
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<div id="display">
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<div id="myDiv"></div>
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</div>
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<pre id="test">
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<script type="application/javascript">
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"use strict";
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/**
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* Test behavior of 'align-self:auto' (Bug 696253)
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* ===============================================
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*
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* The value "align-self: auto" is special. It's the initial value for
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* "align-self", and it's supposed to compute to the parent's "align-items" value.
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*
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* However, to allow its style-struct to be shared by default, we internally
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* make it compute to a special "auto" enumerated value, and then we resolve that
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* to the correct value by examining the parent's style struct whenever we actually
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* need to use it.
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*
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* This test makes sure that optimization isn't detectable to content.
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*
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* One special case of this is inheritance -- e.g.:
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*
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* <html style="align-items: baseline">
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* <body style="align-self: auto; align-items: center">
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* <div style="align-self: inherit">
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*
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* In that example, the child div's "inherit" should get the _computed_ value
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* of "align-self" on the body. That, in turn, is "auto", so it should compute to
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* its parent's "align-items" value, which is "baseline". So we need to end up
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* with a computed "align-self" value of "baseline" on the child.
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*
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* (NOTE: if we instead allowed the child div to directly inherit the value "auto"
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* from its parent, then we'd get different & incorrect behavior. The div would
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* resolve that inherited "auto" value to its own parent's "align-items" value,
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* which is "center" -- not "baseline".)
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*
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* This mochitest tests that situation and a few other similar tricky situations.
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*/
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// Use "is()" and "ok()" from parent document.
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var is = parent.is;
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var ok = parent.ok;
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/*
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* Utility function for getting computed style of "align-self":
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*/
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function getComputedAlignSelf(elem) {
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return window.getComputedStyle(elem, "").alignSelf;
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}
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/*
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* Tests that are useful regardless of whether we have a parent node:
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*/
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function testGeneralNode(elem) {
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// Test initial computed style
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// (Initial value should be 'auto', which should compute to 'stretch')
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is(getComputedAlignSelf(elem), "stretch",
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"initial computed value of 'align-self' should be 'stretch', " +
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"if we haven't explicitly set any style on the parent");
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// Test value after setting align-self explicitly to "auto"
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elem.style.alignSelf = "auto";
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is(getComputedAlignSelf(elem), "stretch",
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"computed value of 'align-self: auto' should be 'stretch', " +
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"if we haven't explicitly set any style on the parent");
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elem.style.alignSelf = ""; // clean up
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// Test value after setting align-self explicitly to "inherit"
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elem.style.alignSelf = "inherit";
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is(getComputedAlignSelf(elem), "stretch",
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"computed value of 'align-self: inherit' should be 'stretch', " +
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"if we haven't explicitly set any style on the parent");
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elem.style.alignSelf = ""; // clean up
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}
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/*
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* Tests that depend on us having a parent node:
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*/
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function testNodeThatHasParent(elem) {
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// Sanity-check that we actually do have a styleable parent:
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ok(elem.parentNode && elem.parentNode.style,
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"bug in test -- expecting caller to pass us a node with a parent");
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// Test initial computed style when "align-items" has been set on our parent.
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// (elem's initial "align-self" value should be "auto", which should compute
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// to its parent's "align-items" value, which in this case is "center".)
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elem.parentNode.style.alignItems = "center";
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is(getComputedAlignSelf(elem), "center",
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"initial computed value of 'align-self' should match parent's " +
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"specified 'align-items' value");
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// ...and now test computed style after setting "align-self" explicitly to
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// "auto" (with parent "align-items" still at "center")
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elem.style.alignSelf = "auto";
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is(getComputedAlignSelf(elem), "center",
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"computed value of 'align-self: auto' should match parent's " +
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"specified 'align-items' value");
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elem.style.alignSelf = ""; // clean up
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elem.parentNode.style.alignItems = ""; // clean up
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// Finally: test computed style after setting "align-self" to "inherit"
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// and leaving parent at its initial value (which should be "auto", which
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// should compute to "stretch")
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elem.style.alignSelf = "inherit";
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is(getComputedAlignSelf(elem), "stretch",
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"computed value of 'align-self: inherit' should take parent's " +
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"computed 'align-self' value (which should be 'stretch', " +
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"if we haven't explicitly set any other style");
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elem.style.alignSelf = ""; // clean up
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}
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/*
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* Tests that depend on us having a grandparent node:
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*/
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function testNodeThatHasGrandparent(elem) {
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// Sanity-check that we actually do have a styleable grandparent:
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ok(elem.parentNode && elem.parentNode.parentNode &&
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elem.parentNode.parentNode.style,
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"bug in test -- should be getting a node with a grandparent");
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// Test computed "align-self" after we set "align-self" to "inherit" on our elem
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// and to "auto" on its parent, and "align-items" to "baseline" on its
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// grandparent. The parent's "auto" value should resolve to "baseline", and
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// that's what our elem should inherit.
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elem.style.alignSelf = "inherit";
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elem.parentNode.style.alignSelf = "auto";
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elem.parentNode.parentNode.style.alignItems = "baseline";
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is(getComputedAlignSelf(elem), "baseline",
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"computed value of 'align-self:inherit' on node when parent has " +
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"'align-self:auto' and grandparent has 'align-items:baseline'")
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// clean up:
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elem.style.alignSelf = "";
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elem.parentNode.style.alignSelf = "";
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elem.parentNode.parentNode.style.alignItems = "";
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// Test computed "align-self" after we set it to "auto" on our node, set
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// "align-items" to "inherit" on its parent, and "align-items" to "baseline"
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// on its grandparent. The parent's "inherit" should compute to "baseline",
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// and our elem's "auto" value should resolve to that.
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elem.style.alignSelf = "auto";
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elem.parentNode.style.alignItems = "inherit";
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elem.parentNode.parentNode.style.alignItems = "baseline";
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is(getComputedAlignSelf(elem), "baseline",
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"computed value of 'align-self:auto on node when parent has " +
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"'align-items:inherit' and grandparent has 'align-items:baseline'")
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// clean up:
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elem.style.alignSelf = "";
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elem.parentNode.style.alignItems = "";
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elem.parentNode.parentNode.style.alignItems = "";
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}
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/*
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* Main test function
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*/
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function main() {
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ok(SpecialPowers.getBoolPref("layout.css.flexbox.enabled"),
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"expecting to be run with flexbox support enabled");
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// Test the root node
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// ==================
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// (It's special because it has no parent style context.)
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var rootNode = document.documentElement;
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// Sanity-check that we actually have the root node, as far as CSS is concerned.
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// (Note: rootNode.parentNode is a HTMLDocument object -- not an element that
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// we inherit style from.)
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ok(!rootNode.parentNode.style,
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"expecting root node to have no node to inherit style from");
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testGeneralNode(rootNode);
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// Test the body node
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// ==================
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// (It's special because it has no grandparent style context.)
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var body = document.getElementsByTagName("body")[0];
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is(body.parentNode, document.documentElement,
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"expecting body element's parent to be the root node");
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testGeneralNode(body);
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testNodeThatHasParent(body);
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// Test the <div id="display"> node
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// ================================
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// (It has both a parent and a grandparent style context.)
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var displayNode = document.getElementById("display");
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is(displayNode.parentNode.parentNode, document.documentElement,
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"expecting 'display' node's grandparent to be the root node");
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testGeneralNode(displayNode);
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testNodeThatHasParent(displayNode);
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testNodeThatHasGrandparent(displayNode);
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parent.finish();
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}
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main();
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</script>
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</pre>
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</body>
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</html>
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