Specificity
p {
background-color: blue;
}
p.red {
background-color: red;
}
div p {
background-color: green;
}
div > p {
background-color: yellow;
}
Inheritance
<div>
<p>
<a href="#">something</a>
</p>
</div>
a {
font-color: red;
}
p {
font-color: green;
}
div {
font-color: blue;
}
body {
font-color: yellow;
}
Cascade
p {
font-color: red;
}
p {
font-color: blue;
}
<link rel="stylesheet" href="styles1.css">
<link rel="stylesheet" href="styles2.css">
<style>p {font-color: green;}</style>
<style>p {font-color: yellow;}</style>
<p style="font-color: cyan;">something</p>