Insert HTML before element in JavaScript

July 16, 2018

With this method (supported by all major browsers, including IE 4), you can take an arbitrary HTML string, and insert it anywhere in the document.

<script>
document.getElementById('heading1').insertAdjacentHTML('beforebegin', '<h3 style="text-align: center;"><strong>Adding Classes</strong></h3>');
document.getElementById('heading5').insertAdjacentHTML('beforebegin', '<h3 style="text-align: center;"><strong>Dropping Classes</strong></h3>');
document.getElementById('heading6').insertAdjacentHTML('beforebegin', '<h3 style="text-align: center;"><strong>FAQs and Hints</strong></h3>');
</script>
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