Check out example codes for "html data attribute". It will help you in understanding the concepts better.
Code Example 1
<!-- data-* attritubes can be used on any html element -->
<div data-my-custom-data="true"></div>
Code Example 2
const article = document.querySelector('#electric-cars');
article.dataset.columns // "3"
article.dataset.indexNumber // "12314"
article.dataset.parent // "cars"
Code Example 3
var element = document.querySelector('.element');
var dataAttribute = element.getAttribute('data-name');
// replace "data-name" with your data attribute name
console.log(dataAttribute);
Code Example 4
<article
id="voitureelectrique"
data-columns="3"
data-index-number="12314"
data-parent="voitures">
...
</article>
var article = document.getElementById('voitureelectrique');
article.dataset.columns // "3"
article.dataset.indexNumber // "12314"
article.dataset.parent // "voitures"
Code Example 5
var dataId = $(this).attr("data-id");
Code Example 6
<a data-color="blue">
This tag contains a user-defined color attribute
</a>
<div data-link="https://github.com/k-vernooy">
This tag contains a data attribute with a link
</div>
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