html/rendering/unmapped-attributes.html

<!doctype html>
<meta charset=utf-8>
<title>Test handling of attributes that should not be mapped into style, but
  incorrectly were in some browsers</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body>
<div id="container" style="display: none"></div>
<iframe></iframe>
<script>
 /*
  * We wand to test both quirks and standards mode.  We can use the fact that
  * our document is in standards mode and the about:blank iframe we have is in
  * quirks mode.
  */
test(() => {
  assert_equals(document.compatMode, "CSS1Compat")
}, "We should be in standards mode");
const container = document.getElementById("container");

const frameDoc = document.querySelector("iframe").contentDocument;
test(() => {
  assert_equals(frameDoc.compatMode, "BackCompat")
}, "Subframe should be in quirks mode");
const frameContainer = frameDoc.createElement("div");
frameContainer.style.display = "none";
frameDoc.body.appendChild(frameContainer);

function newElem(name) {
  return (parent) =>
    parent.appendChild(parent.ownerDocument.createElement(name));
}

 /*
  * Array of tests.  Each test consists of the following information:
  *
  * 1) An element creation function, which takes a parent element as an
  *    argument.
  * 2) The name of the attribute to set
  * 3) The name of the CSS property to get.
  */
const tests = [
  [ newElem("table"), "hspace", "marginLeft" ],
  [ newElem("table"), "hspace", "marginRight" ],
  [ newElem("table"), "vspace", "marginTop" ],
  [ newElem("table"), "vspace", "marginBottom" ],
  [ newElem("embed"), "border", "borderTopWidth" ],
  [ newElem("embed"), "border", "borderRightWidth" ],
  [ newElem("embed"), "border", "borderBottomWidth" ],
  [ newElem("embed"), "border", "borderLeftWidth" ],
  [ newElem("iframe"), "border", "borderTopWidth" ],
  [ newElem("iframe"), "border", "borderRightWidth" ],
  [ newElem("iframe"), "border", "borderBottomWidth" ],
  [ newElem("iframe"), "border", "borderLeftWidth" ],
  [ newElem("iframe"), "hspace", "marginLeft" ],
  [ newElem("iframe"), "hspace", "marginRight" ],
  [ newElem("iframe"), "vspace", "marginTop" ],
  [ newElem("iframe"), "vspace", "marginBottom" ],
  [ newElem("marquee"), "border", "borderTopWidth" ],
  [ newElem("marquee"), "border", "borderRightWidth" ],
  [ newElem("marquee"), "border", "borderBottomWidth" ],
  [ newElem("marquee"), "border", "borderLeftWidth" ],
  // Non-image input
  [ newElem("input"), "border", "borderTopWidth" ],
  [ newElem("input"), "border", "borderRightWidth" ],
  [ newElem("input"), "border", "borderBottomWidth" ],
  [ newElem("input"), "border", "borderLeftWidth" ],
  [ newElem("input"), "width", "width" ],
  [ newElem("input"), "height", "height" ],
  [ newElem("input"), "hspace", "marginLeft" ],
  [ newElem("input"), "hspace", "marginRight" ],
  [ newElem("input"), "vspace", "marginTop" ],
  [ newElem("input"), "vspace", "marginBottom" ],
];

function style(element) {
  return element.ownerDocument.defaultView.getComputedStyle(element);
}

for (let [ctor, attr, prop] of tests) {
  for (let parent of [container, frameContainer]) {
    let elem = ctor(parent);
    test(function() {
      let default_elem = ctor(parent);
      this.add_cleanup(() => {
        elem.remove();
        default_elem.remove();
      });
      elem.setAttribute(attr, "200");
      assert_equals(elem.getAttribute(attr), "200");
      assert_equals(style(elem)[prop], style(default_elem)[prop]);
    }, `<${elem.localName} ${attr}> should not be mapped to style ${prop} in ${parent.ownerDocument.compatMode} mode`);
  }
}
</script>