https://www.w3schools.com/jsrEF/event_ontoggle.asp
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https://www.php.net/manual/tr/ui-controls-check.ontoggle.php
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https://www.w3schools.com/tags/att_ontoggle.asp
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Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
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