what HTML tags broke page layout?

I want posting in my website to be as rich HTML tags as possible, but safe.

this is tags used in my website:

<a> <p> <span> <div> <h1> <h2> <h3> <h4> <h5> <开发者_开发技巧;h6> <img> <map> <area> <hr> <br> <br /> <ul> <ol> <li> <dl> <dt> <dd> <table> <tr> <td> <em> <b> <u> <i> <strong> <font> <del> <ins> <sub> <sup> <quote> <blockquote> <pre> <address> <code> <cite> <embed> <object> <param> <strike> <caption> <s> <textarea>

my website is in drupal.. and when viewing front page (/node), the layout broken

What is your DOCTYPE? If your type is XHTML then

<hr> and <br>

should never be used.