17 lines
306 B
HTML
17 lines
306 B
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<script type="application/javascript">
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"use strict";
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addEventListener("message", event => {
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if ("ping" in event.data) {
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event.source.postMessage({ pong: event.data.ping }, event.origin);
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}
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});
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</script>
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</head>
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<body>
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</body>
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</html>
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