demo04- default label

<-! 
    Declare an HTML document, a statement of HTML5 document 
-> 
<! DOCTYPE HTML > 
<! - 
    HTML start tag, similar to the Python function inside the entrance main 
-> 
< HTML > 
    <! - 
        head : Indicates the head tag 
    -> 
    < head > 
        <-! 
            charset: encoding formats 
            generally GBK, GB2312, in the development of our general-8 can only use the UTF 
        -> 
        < Meta charset = "UTF-8" > 
        <! - 
            mainly in the top of the screen is a browser 
        -> 
        < title > catalyst </ title > 
    </ head > 
    <!--
        body: body label, mainly used to store our HTML code 
    -> 
    < body > 
    </ body > 
</ HTML >