white-space

p.test { white-space: normal;}
p.test1 { white-space: pre;}
p.test2 { white-space: nowrap;}

Value	Description
normal	Consecutive spaces, tabs, and line breaks in the text are displayed as a single space. Text wraps automatically to fit the containing element's width. This 'normal' is the initial value.
pre	Spaces, tabs, and line breaks in the text are preserved and displayed as-is.
nowrap	Consecutive spaces, tabs, and line breaks in the text are displayed as a single space. Text does not wrap automatically.

These samples use the following string:

This is a p element.     Text. Text.
		Text. Text. Text.

<p style="border: solid 1px; white-space: normal; width: 200px;">This is a p element.     Text. Text.
Text. Text. Text.</p>

<p style="border: solid 1px; white-space: pre; width: 200px;">This is a p element.     Text. Text.
Text. Text. Text.</p>

<p style="border: solid 1px; white-space: nowrap; width: 200px;">This is a p element.     Text. Text.
Text. Text. Text.</p>

※ Version data is based on MDN.