How does semantics affect accessibility?

Semantics directly affects accessibility because it helps users with disabilities perceive, understand, and navigate a site as effectively as everyone else. Here is exactly how:

#1. Screen readers understand the structure

Semantic tags (<nav>, <header>, <main>, <section>, <footer>) let assistive technologies understand where the menu is, where the main content is, and where secondary content is. This improves navigation without visual perception.

#2. Headings and hierarchy

The <h1>-<h6> tags define the document's structure. Screen readers can read just the headings, helping the user quickly orient themselves. Without them, everything blends into a single stream.

#3. Explicit element roles

A button should be <button>, not <div onclick>. Correct tags automatically provide role, focus, and behavior, which is critical for keyboard or voice control.

#4. Forms and controls

Semantic tags (<label>, <input>, <fieldset>, <legend>) give hints about the purpose of fields. This is especially important for users with cognitive or motor impairments.

#5. Fewer workarounds, more compatibility

When semantics is used, browsers, screen readers, and interaction devices work to the standard, without hacks.

Conclusion: semantics makes HTML not just "how it looks" but "what it means". For accessibility, this is the foundation. Without it, a site can be visually attractive yet practically unusable for a significant share of users.