Source code
Revision control
Copy as Markdown
Other Tools
Test Info:
- This WPT test may be referenced by the following Test IDs:
- /html/rendering/replaced-elements/attributes-for-embedded-content-and-images/align.html - WPT Dashboard Interop Dashboard
<!doctype html>
<title>align attribute mapping on replaced elements</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<img id="replaced" src="/images/green.png">
<something id="non-replaced"></something>
<script>
const kMapping = {
"left": ["float", "left"],
"right": ["float", "right"],
"top": ["vertical-align", "top"],
// These two require a magic value (`-moz-middle-with-baseline` on Gecko,
// `-webkit-baseline-middle` on WebKit-based browsers).
"middle": ["vertical-align", undefined],
"center": ["vertical-align", undefined],
"baseline": ["vertical-align", "baseline"],
"bottom": ["vertical-align", "baseline"], // *shrug*
"texttop": ["vertical-align", "text-top"],
"absmiddle": ["vertical-align", "middle"],
"abscenter": ["vertical-align", "middle"],
"absbottom": ["vertical-align", "bottom"],
};
const kInitialValues = {
"vertical-align": "baseline",
"float": "none",
};
const kVerticalAlignKeywords = [
"baseline",
"sub",
"super",
"text-top",
"text-bottom",
"middle",
"top",
"bottom",
];
let replaced = document.getElementById("replaced");
let nonReplaced = document.getElementById("non-replaced");
let t = async_test("align attribute mapping");
onload = t.step_func_done(function() {
for (const attributeValue in kMapping) {
for (const element of [replaced, nonReplaced]) {
test(function() {
element.setAttribute("align", attributeValue);
let [property, expected] = kMapping[attributeValue];
let actual = getComputedStyle(element).getPropertyValue(property);
if (element == nonReplaced) {
assert_equals(actual, kInitialValues[property], "align shouldn't map to non-replaced elements")
} else {
if (expected) {
assert_equals(actual, expected, `align=${attributeValue} should map to ${property}: ${expected}`);
} else {
assert_equals(property, "vertical-align");
assert_false(
kVerticalAlignKeywords.includes(actual),
`align=${attributeValue} should map to a special vertical-align value`
);
}
}
}, `align=${attributeValue} on ${element == replaced ? "replaced" : "non-replaced"} elements`);
}
}
});
</script>