test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => frame.contentDocument.close());
assert_equals(frame.contentDocument.compatMode, "BackCompat");
frame.contentDocument.open();
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
frame.contentDocument.close();
assert_equals(frame.contentDocument.compatMode, "BackCompat");
}, "document.open() sets document to no-quirks mode (write no doctype)");
test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => frame.contentDocument.close());
assert_equals(frame.contentDocument.compatMode, "BackCompat");
frame.contentDocument.open();
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
frame.contentDocument.write("");
assert_equals(frame.contentDocument.compatMode, "BackCompat");
frame.contentDocument.close();
assert_equals(frame.contentDocument.compatMode, "BackCompat");
}, "document.open() sets document to no-quirks mode (write old doctype)");
test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => frame.contentDocument.close());
assert_equals(frame.contentDocument.compatMode, "BackCompat");
frame.contentDocument.open();
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
frame.contentDocument.write("");
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
frame.contentDocument.close();
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
}, "document.open() sets document to no-quirks mode (write new doctype)");
// This tests the document.open() call in fact sets the document to no-quirks
// mode, not limited-quirks mode. It is derived from
// quirks/blocks-ignore-line-height.html in WPT, as there is no direct way to
// distinguish between a no-quirks document and a limited-quirks document. It
// assumes that the user agent passes the linked test, which at the time of
// writing is all major web browsers.
test(t => {
const frame = document.body.appendChild(document.createElement("iframe"));
t.add_cleanup(() => frame.contentDocument.close());
assert_equals(frame.contentDocument.compatMode, "BackCompat");
frame.contentDocument.open();
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
// Create the DOM tree manually rather than going through document.write() to
// bypass the parser, which resets the document mode.
const html = frame.contentDocument.appendChild(frame.contentDocument.createElement("html"));
const body = html.appendChild(frame.contentDocument.createElement("body"));
assert_equals(frame.contentDocument.body, body);
body.innerHTML = `
x
x
x
`;
assert_equals(frame.contentDocument.compatMode, "CSS1Compat");
const idTest = frame.contentDocument.getElementById("test");
const idRef = frame.contentDocument.getElementById("ref");
const idSRef = frame.contentDocument.getElementById("s_ref");
assert_equals(frame.contentWindow.getComputedStyle(idTest).height,
frame.contentWindow.getComputedStyle(idSRef).height);
assert_not_equals(frame.contentWindow.getComputedStyle(idTest).height,
frame.contentWindow.getComputedStyle(idRef).height);
}, "document.open() sets document to no-quirks mode, not limited-quirks mode");