Difference between id and class in HTML

• id
• • Unique identifier for a single element.
  • Only one per page (shouldn’t repeat).
  • Used for:
  • • Anchors (#section1)
    • JS DOM access (document.getElementById).
    • CSS: #idName { ... }
• class
• • Can be used by multiple elements.
  • Groups elements with shared styling/behavior.
  • An element can have multiple classes.
  • CSS: .className { ... }
  • JS: document.getElementsByClassName.

Example