Component resources contain markup and have a .cmp suffix. The markup can contain text or references to other components, and also declares metadata about the component.
Let's start with a simple "Hello, world!" example in a helloWorld.cmp component.
<!-- otherprops: set_clipboard --><aura:component>
Hello, world!
</aura:component>
This is about as simple as a component can get. The "Hello, world!" text is wrapped in the <aura:component> tags, which appear at the beginning and end of every component definition.
Components can contain most HTML tags so you can use markup, such as <div> and <span>. HTML5 tags are also supported.
<aura:component>
<div class="container">
<!--Other HTML tags or components here-->
</div>
</aura:component>
note: Case sensitivity should be respected as your markup interacts with JavaScript, CSS, and Apex.
See Also