</p>
is only required in XHTML but not in HTML. Some times you have to close it anyway , e.g. when you align the paragraph left/right/center.
Would mixing the usage of </p>
as in the following be a bad idea? Note that there is no ending </p>
tag in the 1st and 3rd paragraph.
<h1>My article</h1>
<p>This is my 1st paragraph.
<p class="align=right">This is my 2nd paragraph</p>
<p>This is my 3rd paragraph.
Reasons why I don't want to close the P-tags:
P-end-tag is only required in XHTML, not in HTML.
Correct
But some times you have to close it any way eg. when you align the paragraph left/right/center.
Incorrect. The only time you need an explicit end tag is when you want to end the paragraph and immediately follow it by something that is allowed inside a paragraph (such as text or an inline element). This is usually a bad idea.
Would it for any reason be a bad idea to mix the usage of P-end-tag
Only that consistency is a virtue which aids in code maintenance.