Syntax [crayon-5efb83e4cf0aa84646327 It just means that the attribute is to be declared without a value. aside should not be used as a sidebar at all. It is a great starting point for minimal dashboard web apps, or general websites with a toggleable sidebar. Collapsible Sidebar Using Bootstrap 4. The sidebar looks extremely standard in light of the white text with a dark foundation. "Required" is a boolean attribute, new to HTML 5. To use this in conjunction with a fullscreen navigation, you have to use two copies of the same UL. {{Sidebar with collapsible lists}} is a version of {{}} that adds collapsibility to its sections, i.e. Adding a sidebar in HTML5 and responsive templates is done using a div and css float code. For example, the