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docs: add Synchronous Messages Fiddle example (#20451)

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* docs: add Synchronous Messages Fiddle example

* Code review changes

* Add OS support info
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Amarnath Karthi 2019-11-01 23:32:42 +05:30 • committed by John Kleinschmidt
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
</head>
<body>
<div>
<div>
<h1>Synchronous messages</h1>
<i>Supports: Win, macOS, Linux <span>|</span> Process: Both</i>
<div>
<div>
<button id="sync-msg">Ping</button>
<span id="sync-reply"></span>
</div>
<p>You can use the <code>ipc</code> module to send synchronous messages between processes as well, but note that the synchronous nature of this method means that it <b>will block</b> other operations while completing its task.</p>
<p>This example sends a synchronous message, "ping", from this process (renderer) to the main process. The main process then replies with "pong".</p>
</div>
</div>
</div>
<script>
// You can also require other files to run in this process
require('./renderer.js')
</script>
</body>
</html>