Semantic HTML is HTML that uses elements for their intended meaning, such as headings, lists, buttons, forms, and landmarks. Instead of relying only on visual layout, it tells browsers and assistive technologies what each part of a page does. That helps screen readers, keyboard users, and automated tools understand structure, focus order, and control behavior.
In cyber security, semantic HTML matters because security-sensitive flows must be usable and hard to misunderstand. Clear labels and proper button elements reduce user error during logins, password resets, consent prompts, and MFA steps. They also help security scanners and accessibility audits detect missing controls or broken navigation. In attacks, poorly structured pages can make deceptive overlays, fake buttons, and hidden traps easier to miss. In defense, semantic structure supports safer interfaces, better testing, and fewer opportunities for confusion that attackers can exploit.