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+<!DOCTYPE html>
+
+ <meta charset="UTF-8">
+
+ <title>CSS Containment Test: 'contain: paint' and margin collapsing</title>
+
+ <link rel="author" title="GĂ©rard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/">
+ <link rel="help" href="https://www.w3.org/TR/css-contain-1/#containment-paint">
+ <link rel="match" href="reference/contain-paint-ifc-011-ref.html">
+
+ <meta content="This test checks that a block element with 'contain: paint' establishes a new block formatting context which is independent and separate from others. This causes margin collapsing to be ineffective among vertically-adjacent boxes. In this test, the top margin of parent boxes and top margin of their respective first in-flow child do not collapse. Also, in this test, the bottom margin of the last in-flow child of boxes and bottom margin of their respective parent boxes do not collapse." name="assert">
+
+ <style>
+ div
+ {
+ contain: paint;
+ margin: 30px 0px;
+ }
+
+ div#grand-grand-parent-orange
+ {
+ background-color: orange;
+ }
+
+ div#grand-parent-blue
+ {
+ background-color: blue;
+ }
+
+ div#parent-lime
+ {
+ background-color: lime;
+ }
+
+ div#collapse-through-child /* margin collapsing through element */
+ {
+ contain: none;
+ }
+ </style>
+
+ <p>Test passes if there are 5 horizontal stripes across the page in this order (from top to bottom): an orange stripe, a blue stripe, a bright green stripe, a blue stripe and then an orange stripe.
+
+ <div id="grand-grand-parent-orange">
+
+ <div id="grand-parent-blue">
+
+ <div id="parent-lime">
+
+ <div id="collapse-through-child"></div>
+
+ </div>
+
+ </div>
+
+ </div>