This is a paragraph.

This is another paragraph.

This paragraph contains a lot of lines in the source code, but the browser ignores it.

This paragraph contains a lot of spaces in the source code,but the brrowser ignores it.

The number of lines in a paragraph depends on the size of the browser window.If you resize the browser window, the number of lines in this paragraph wil change.

This is
a paragraph
with line breaks

The pre tag preserves both spaces and line breaks:

				My Bonnie lies over the ocean.
				
				My Bonnie lies over the sea.
				
				My Bonnie lies over the ocean
				
				Oh, bring back my Bonnie to me.