HTML <optgroup> disabled Attribute

The disabled attribute of the is used to disable an option-group. After that, the option-group becomes unclickable. Following is the syntax ?

Let us now see an example to implement the disabled attribute of the element ?

Example

Water Levels
Impurity Level 

   
      3:2
      5:3
   
   
      2L
      5L
      10L
      20L
   

Output

In the above example, we have set two option-groups ?

   3:2
   5:3


   2L
   5L
   10L
   20L

We have set one of the option-group as disabled ?

   2L
   5L
   10L
   20L

Now the above options will become disabled and visitors won?t be able to select them.