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If your <script> is placed at the bottom of the <body>, it should run after the iframe exists in the DOM, so you're all good. If you're placing the <script> inside the <head> then you would need to grab the iframe and set its source after the body loads.
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If your
<script>is placed at the bottom of the<body>, it should run after the iframe exists in the DOM, so you're all good. If you're placing the<script>inside the<head>then you would need to grab the iframe and set its source after the body loads.