data-
Custom data attributes are intended to store custom data private to the page or application, for which there are no more appropriate attributes or elements. 3.2.5.7. Embedding custom non-visible data with the data-* attributes
Links about data-
A Complete Guide to Data Attributes | CSS-Tricks
Everything you ever wanted to know about data attributes in HTML, CSS, and JavaScript.
Code sample
<h3 data-author-id="bob">
Bob
</h3>Explore other pages
- display
Defines an element’s display type.
- svg
SVG is a language for describing two-dimensional graphics.
- display: contents
An element doesn't generate any boxes, but its children still do.
- button
A control allowing a user to trigger actions.