What is the impact of nesting "optgroup" elements within a "select" list?

  • It groups options but without any labels. 
  • It creates a hierarchy of labeled groups within the list. 
  • It is not allowed in HTML specifications. 
  • It sorts the options alphabetically. 
The "optgroup" element is used within a "select" list to group related options together under a shared label. However, according to HTML specifications, nesting one "optgroup" inside another is not allowed. When you nest them, the inner "optgroup" and its options will not be displayed correctly in many browsers. Always ensure that "optgroup" elements are direct children of the "select" and not nested within other "optgroup" elements. 
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