Check out example codes for "tab in html". It will help you in understanding the concepts better.

Code Example 1

&nbsp;  <!-- 1 space -->
&ensp;	<!-- tab; 2 space -->
&emsp;	<!-- tab; 4 space -->

Code Example 2

&emsp;

Code Example 3

&emsp;

Code Example 4

&#9; or &tab;

Code Example 5

<p style="text-indent :5em;" > </p>

Code Example 6

<!-- Answer to: "tab in html" -->

<!--
  Since Tab is a character-entity of U+0009 you can set the
  width of the Tab by using tab-size in CSS.
-->

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