Web Reference: Dec 17, 2025 · Data attributes are useful in the cases where everything is present in the markup, and JavaScript is only needed for handling events, syncing state, etc. For example, in our carousel with scroll margin example, we have an HTML page already populated with many elements. data-* attribute gives us the ability to embed custom data attributes on all HTML elements. The stored (custom) data can then be used in the page's JavaScript to create a more engaging user experience (without any Ajax calls or server-side database queries). Sep 8, 2012 · As a general rule, you should always use get/setAttribute to change an elements attributes, because you can't rely on the property being there. Side-note: Those "attributes" should be data: data- dataset document.getElementById('buy').dataset.token.
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