Use CSS code to style your site headers with borders and other design elements. HTML and CSS use a box model, which means that page elements include margins, padding, background colors and ...

The divs are set to a fixed width of 300 pixels and have a 1-pixel black border to make the layout easier to see. In your browser, you will see that the boxes are now displayed side by side ...

The inert attribute. Most browsers (including Chrome, Edge, and Safari) now have support for inert.At the time of this writing, it is slated to be added to Firefox 112.