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<!doctype html>
<meta charset="utf-8">
<title>Image dimensions are available synchronously after changing src to an already-loaded image</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1797798">
<img id="existing">
<script>
let src = "/images/green.png";
let existing = document.getElementById("existing");
async_test(function(t) {
let tmp = document.createElement("img");
tmp.src = src;
tmp.onload = t.step_func_done(function() {
existing.src = src;
assert_equals(existing.width, 100);
assert_equals(existing.height, 50);
});
});
</script>
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