diff --git a/LayoutTests/fast/css/link-disabled-attr.html b/LayoutTests/fast/css/link-disabled-attr.html
new file mode 100644
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+++ b/LayoutTests/fast/css/link-disabled-attr.html
@@ -0,0 +1,103 @@
+<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
+<html>
+<head>
+<link id="sheet" rel="stylesheet" href="../js/resources/js-test-style.css">
+<link id="notsheet" rel="author" href="mailto:nosuch@webkit.org">
+<link id="alt" rel="alternate stylesheet" title="altset" href="resources/green.css">
+<script src="../js/resources/js-test-pre.js"></script>
+</head>
+<body>
+<p id="description">
+Series of tests to validate behavior of getting/setting link.disabled and link.sheet.disabled.<br>
+Test for bug <a href="https://bugs.webkit.org/show_bug.cgi?id=61400">61400</a>: REGRESSION(84329): Stylesheets on some pages do not load
+</p>
+<div id="console"></div>
+<script>
+
+window.jsTestIsAsync = true;
+
+function onSheetLoaded(f, elem, maxtime) {
+    if (elem.sheet || maxtime <= 0)
+        f(elem);
+    else
+        setTimeout(function () { onSheetLoaded(f, elem, maxtime - 25);}, 25);
+}
+
+
+
+// With a non-stylesheet <link>, 'disabled' is always false.
+
+var console = document.getElementById("console");
+var originalBG = getComputedStyle(console).backgroundColor;
+var link;
+
+debug("notsheet");
+
+link = document.getElementById("notsheet");
+shouldBeNull("link.sheet");
+link.disabled = true;
+shouldBeFalse("link.disabled");
+
+
+// With a stylesheet <link>, 'disabled' and 'link.style.disabled' should both
+// work, and be consistent with each other.
+
+debug("sheet");
+
+link = document.getElementById("sheet");
+shouldBeNonNull("link.sheet");
+
+link.sheet.disabled = true;
+shouldBeTrue("link.disabled");
+shouldBeTrue("link.sheet.disabled");
+shouldBe("getComputedStyle(console).whiteSpace", "'normal'");
+
+link.disabled = false;
+shouldBeFalse("link.disabled");
+shouldBeFalse("link.sheet.disabled");
+shouldBe("getComputedStyle(console).whiteSpace", "'pre-wrap'");
+
+link.sheet.disabled = false;
+
+
+// An alternate stylesheet defaults to disabled when its title does not
+// match the preferred set.
+
+debug("altsheet");
+link = document.getElementById("alt");
+shouldBeTrue("link.disabled");
+
+// Toggling link.disabled activates the stylesheet.
+
+function altSheetLoaded(e) {
+    link = e;
+    shouldBeNonNull("link.sheet");
+    shouldBe("getComputedStyle(console).backgroundColor", "'rgb(0, 128, 0)'");
+
+    // Enabling a stylsheet set modifies disabled status of style sheets.
+
+    document.selectedStyleSheetSet = "nosuchset";
+    shouldBeTrue("link.disabled");
+    shouldBe("getComputedStyle(console).backgroundColor", "originalBG");
+
+    document.selectedStyleSheetSet = "altset";
+    shouldBeFalse("link.disabled");
+    shouldBe("getComputedStyle(console).backgroundColor", "'rgb(0, 128, 0)'");
+
+    // Disabling a stylesheet *after* its stylesheet set has been selected
+    // de-activates it.
+
+    link.disabled = true;
+    shouldBe("getComputedStyle(console).backgroundColor", "originalBG");
+
+    finishJSTest();
+}
+
+link.disabled = false;
+onSheetLoaded(altSheetLoaded, link, 500);
+
+successfullyParsed = true;
+
+</script>
+<script src="../js/resources/js-test-post.js"></script>
+</body></html>