Java: Java Programming For Beginners a simple Start To Java Programming (Written By a software Engineer)

Self-closing Tags
If  you  are  using  an  element  that  does  not  contain  any  content,  then  you  can  use  a  self
closing  tag.  An  example  of  this  tag  is  
.  However,  please  note  that  other  tags  like

have to be written as
even if they do not have any content.
How to Add Expando Attributes

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Any  attribute  that  you  as  the  author  define  is  known  as  expando  attribute.  You  can  give
this custom attribute a name and assign a value to the same as and when required.
How to Add Comments
Comments can be added using a ! and two hyphens (-). The syntax for adding comments is
as follows:
You can also add conditional comments using the following syntax:

This comment determines if the browser being used is an earlier version released earlier
than IE7.