What <HTML> tags does it support?

when we load an external text field that render as html, is it that it does not support many kind of html tags.

I have tried some. it do support tags such as <br>, <b></b>, <i></i>, <a href=“http://www.xxx.com”></a>…

however, why it cannot support tags such as <div align></div>,
<table></table>,<img src=“xx”>…?