CODE EXAMPLE FOR HTML

difference between xhtml and html

<!--- HTML --->
<br>
<!--- XHTML --->
<br />
<!--- HTML --->
Hypertext Markup Language
<!--- XHTML --->
eXtended Hypertext Markup Language
<!--- HTML --->
<BUTTON> HTML is case-insensitive</BUTTON>
<!--- XHTML --->
<button> Strictly lower case </button>