Attributes

HTML markup has certain information, or attributes, that explain a particular content's look and behavior.

Attributes can be written inline as part of the HTML markup.

<h1 style="color: red; font-size: 32pt;">Feature 1</h1>

However, it's more powerful (and recommended) to use an external stylesheet instead, where you can write attributes in declaration blocks.

h1
{
    color: red;
    font-size: 32pt;
}