The aim of this article is to make you understand the composition of colors and their relationship to HTML. You will learn how you can see a color and reproduce it using numbers.
Many HTML elements can be given a color. Some of these elements can each have a foreground color and a background color. In the absence of the foreground color, you will see the background color. The foreground color is simply referred to as color. I assume for this article that you have basic knowledge of HTML and CSS. You do not need to be good in physics in order to understand this article.
You give an element a color by using Cascading Style Sheets. The code below gives the table cell a green color and a blue background color.
<html>
<head>
<style type="text/css">
td#td1 {color:red; background-color:blue}
</style>
</head>
<body>
<table>
<tbody>
<tr>
<td id="td1">
Text color is red
</td>
</tr>
</tbody>
</table>
</body>
</html>
There is a nuance here: the color (foreground-color) of a block element (e.g. BODY, DIV, Paragraph) is the color of the text and not another surface area.
Note how the color and background color have been indicated in the style sheet.
HTML 
HTML5 Boilerplate Introduction
