Bug 1960567 - remove the last C++ and scriptable APIs to accumulate data to legacy telemetry histograms, r=chutten.
Differential Revision:
https://phabricator.services.mozilla.com/D255582
<!DOCTYPE html>
<title>View transitions: iframe</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:vmpstr@chromium.org">
<style>
iframe { width: 500px; height: 500px }
</style>
<iframe srcdoc="
<style>
div {
width: 100px;
height: 100px;
background: green;
}
html { height: 50%; }
</style>
<div></div>
"></iframe>