3. :not() Selector
      Categories: Selectors > Basic Filter
      not selector
      Description: Selects all elements that do not match the given selector.
      • version added: 1.0jQuery( ":not(selector)" )
        selector: A selector with which to filter by.
          
      All selectors are accepted inside :not(),  for example: :not(div a) and :not(div,a).
          
      Additional Notes
          
      The .not() method will end up providing you with more readable selections than pushing complex selectors or variables into a :not() selector filter. In most cases, it is a better choice.
        
      Example:
      Finds all inputs that are not checked and highlights the next sibling span.  Notice there is no change when clicking the checkboxes since no click events have been linked.
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      <!doctype html>
      <html lang="en">
      <head>
        <meta charset="utf-8">
        <title>not demo</title>
        <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
      </head>
      <body>
       
      <div>
        <input type="checkbox" name="a">
        <span>Mary</span>
      </div>
      <div>
        <input type="checkbox" name="b">
        <span>lcm</span>
      </div>
      <div>
        <input type="checkbox" name="c" checked="checked">
        <span>Peter</span>
      </div>
       
      <script>
      $( "input:not(:checked) + span" ).css( "background-color", "yellow" );
      $( "input").attr( "disabled", "disabled" );
      </script>
       
      </body>
      </html>
      Demo:
      2. 
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