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<!DOCTYPE html>
<script>
self.addEventListener('message', function(e) {
// Send paint-timing entries upon receiving a message.
const paintEntries = performance.getEntriesByType('paint');
let entryContents = paintEntries.length + '';
for (let i = 0; i < paintEntries.length; i++) {
const entry = paintEntries[i];
entryContents += ' ' + entry.entryType + ' ' + entry.name;
}
parent.postMessage(entryContents, '*');
});
</script>