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HTML/CSSAdvanced#html#security
HTML/CSSAdvanced#html#javascript
What is the <template> element used for?
<template> holds inert HTML markup that isn't rendered or executed until explicitly cloned and inserted into the DOM via JavaScript, useful for reusable chunks like list item templates in dynamic UIs.
Example
<template id="row"><tr><td class="name"></td></tr></template>
<script>
const clone = document.getElementById('row').content.cloneNode(true);
document.querySelector('tbody').appendChild(clone);
</script>