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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=783607
+-->
+<head>
+  <title>Test rounding behaviour for &lt;input type='number'&gt;</title>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <meta charset="UTF-8">
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=783607">Mozilla Bug 783607</a>
+<p id="display"></p>
+<div id="content">
+  <input id=number type=number value=0 step=0.01 max=1>
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/**
+ * Test for Bug 783607.
+ * This test checks that when <input type=number> has fractional step values,
+ * the values that a content author will see in their script will not have
+ * ugly rounding errors.
+ **/
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  test();
+  SimpleTest.finish();
+});
+
+/**
+ * We can _NOT_ generate these values by looping and simply incrementing a
+ * variable by 0.01 and stringifying it, since we'll end up with strings like
+ * "0.060000000000000005" due to the inability of binary floating point numbers
+ * to accurately represent decimal values.
+ */
+var stepVals = [
+  "0",   "0.01", "0.02", "0.03", "0.04", "0.05", "0.06", "0.07", "0.08", "0.09",
+  "0.1", "0.11", "0.12", "0.13", "0.14", "0.15", "0.16", "0.17", "0.18", "0.19",
+  "0.2", "0.21", "0.22", "0.23", "0.24", "0.25", "0.26", "0.27", "0.28", "0.29",
+  "0.3", "0.31", "0.32", "0.33", "0.34", "0.35", "0.36", "0.37", "0.38", "0.39",
+  "0.4", "0.41", "0.42", "0.43", "0.44", "0.45", "0.46", "0.47", "0.48", "0.49",
+  "0.5", "0.51", "0.52", "0.53", "0.54", "0.55", "0.56", "0.57", "0.58", "0.59",
+  "0.6", "0.61", "0.62", "0.63", "0.64", "0.65", "0.66", "0.67", "0.68", "0.69",
+  "0.7", "0.71", "0.72", "0.73", "0.74", "0.75", "0.76", "0.77", "0.78", "0.79",
+  "0.8", "0.81", "0.82", "0.83", "0.84", "0.85", "0.86", "0.87", "0.88", "0.89",
+  "0.9", "0.91", "0.92", "0.93", "0.94", "0.95", "0.96", "0.97", "0.98", "0.99",
+  "1"
+];
+
+var pgUpDnVals = [
+  "0", "0.1", "0.2", "0.3", "0.4", "0.5", "0.6", "0.7", "0.8", "0.9", "1"
+];
+
+function test() {
+  var elem = document.getElementById("number");
+
+  elem.focus();
+
+  /**
+   * TODO:
+   * When <input type='number'> widget will have a widge we should test PAGE_UP,
+   * PAGE_DOWN, UP and DOWN keys. For the moment, there is no widget so those
+   * keys do not have any effect.
+   * The tests using those keys as marked as todo_is() hoping that at least part
+   * of them will fail when the widget will be implemented.
+   */
+
+/* No other implementations implement this, so we don't either, for now.
+   Seems like it might be nice though.
+
+  for (var i = 1; i < pgUpDnVals.length; ++i) {
+    synthesizeKey("VK_PAGE_UP", {});
+    todo_is(elem.value, pgUpDnVals[i], "Test VK_PAGE_UP");
+    is(elem.validity.valid, true, "Check element is valid for value " + pgUpDnVals[i]);
+  }
+
+  for (var i = pgUpDnVals.length - 2; i >= 0; --i) {
+    synthesizeKey("VK_PAGE_DOWN", {});
+    // TODO: this condition is there because the todo_is() below would pass otherwise.
+    if (stepVals[i] == 0) { continue; }
+    todo_is(elem.value, pgUpDnVals[i], "Test VK_PAGE_DOWN");
+    is(elem.validity.valid, true, "Check element is valid for value " + pgUpDnVals[i]);
+  }
+*/
+
+  for (var i = 1; i < stepVals.length; ++i) {
+    synthesizeKey("VK_UP", {});
+    is(elem.value, stepVals[i], "Test VK_UP");
+    is(elem.validity.valid, true, "Check element is valid for value " + stepVals[i]);
+  }
+
+  for (var i = stepVals.length - 2; i >= 0; --i) {
+    synthesizeKey("VK_DOWN", {});
+    // TODO: this condition is there because the todo_is() below would pass otherwise.
+    if (stepVals[i] == 0) { continue; }
+    is(elem.value, stepVals[i], "Test VK_DOWN");
+    is(elem.validity.valid, true, "Check element is valid for value " + stepVals[i]);
+  }
+
+  for (var i = 1; i < stepVals.length; ++i) {
+    elem.stepUp();
+    is(elem.value, stepVals[i], "Test stepUp()");
+    is(elem.validity.valid, true, "Check element is valid for value " + stepVals[i]);
+  }
+
+  for (var i = stepVals.length - 2; i >= 0; --i) {
+    elem.stepDown();
+    is(elem.value, stepVals[i], "Test stepDown()");
+    is(elem.validity.valid, true, "Check element is valid for value " + stepVals[i]);
+  }
+}
+
+</script>
+</pre>
+</body>
+</html>