How should you show that an accordion is expanded?

1. Which way should arrows point in a collapsible accordion?
2. How do you add an expand and collapse button in HTML?
3. How do I collapse an accordion by default?
4. How accordion works in Bootstrap?

Which way should arrows point in a collapsible accordion?

I'd say the convention is for the arrow to point right when collapsed and down when expanded.

How do you add an expand and collapse button in HTML?

To control (show/hide) the collapsible content, add the data-toggle="collapse" attribute to an <a> or a <button> element. Then add the data-target="#id" attribute to connect the button with the collapsible content (<div id="demo">).

How do I collapse an accordion by default?

This can be done by setting the 'active' property of jQuery Accordion as false.

How accordion works in Bootstrap?

The Bootstrap accordion is a component that organizes content within collapsable items. Accordion allows the display of only one collapsed item at a time. Accordions can toggle through a number of text blocks with a single click, and that greatly enhances the UX of your project.