What disadvantages are there to the <button> tag?

Question

I started using a diagnostic css stylesheet, e.g. http://snipplr.com/view/6770/css-diagnostics--highlight-deprecated-html-with-css--more/

One of the suggested rules

Answer 1

Everything you need to know: W3Schools Tag

The tag is supported in all major browsers.

Important: If you use the button element in an HTML form, different browsers will submit different values. Internet Explorer will submit the text between the

and tags, while other browsers will submit the content of the value attribute. Use the input element to create buttons in an HTML form.