mozilla-release/layout/style/test/test_attribute_selector_eof_behavior.html

<!DOCTYPE html>
<meta charset=utf-8>
<title>Test for EOF behavior of attribute selectors in selectors API</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<script>
test(function() {
  assert_equals(document.querySelector("[id"),
                document.getElementById("log"),
                "We only have one element with an id");
}, "']' should be implied if EOF after attribute name");
test(function() {
  assert_equals(document.querySelector('[id="log"'),
                document.getElementById("log"),
                "We should find the element with id=log");
}, "']' should be implied if EOF after attribute value");
</script>