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+<html>
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+<style>
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+.ball {
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+ border-radius: 9999px;
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+ width: 40px;
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+ height: 40px;
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+ display: inline-block;
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+}
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+.pass {
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+ background: green;
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+}
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+.fail {
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+ background: red;
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+}
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+</style>
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+<p>This test verifies that various HTMLCollection properties have <b>[SameObject]</b> behavior.</p>
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+<p>You should see a bunch of green balls below this line.</p>
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+ <div id="out"></div>
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+ <form><table><thead><tr><td></td></tr></thead></table></form>
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+
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+<script>
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+ let out = document.querySelector("#out")
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+
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+ function test(expr) {
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+ let a = eval(expr)
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+ let b = eval(expr)
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+ let e = document.createElement("div")
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+ e.className = "ball " + ((a === b) ? "pass" : "fail")
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+ out.appendChild(e)
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+ }
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+
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+ let table = document.querySelector("table")
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+ let tr = document.querySelector("tr")
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+ let form = document.querySelector("form")
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+ let thead = document.querySelector("thead")
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+
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+ test("table.tBodies")
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+ test("table.rows")
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+ test("thead.rows")
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+ test("tr.cells")
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+ test("form.elements")
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+
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+ test("document.applets")
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+ test("document.anchors")
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+ test("document.images")
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+ test("document.embeds")
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+ test("document.plugins")
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+ test("document.links")
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+ test("document.forms")
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+ test("document.scripts")
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+</script>
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+</html>
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Andreas Kling