辅助技术入门：屏幕阅读器、开关和放大镜

Assistive technology is software and hardware that turns your markup into something a person can actually use. Let us meet the main ones. 🛠️

A screen reader speaks the page aloud or sends it to a braille display. It reads your text, links, and headings in order.

You will hear about NVDA and JAWS on Windows, VoiceOver on Apple devices, and TalkBack on Android. Each ships with the platform or is free.

A screen reader announces meaning from your HTML. A real heading is announced as a heading, which is why correct tags matter so much.

A screen magnifier blows up part of the display for low-vision users. They see a zoomed slice and pan around it.

Magnifiers track the keyboard focus and caret. If focus jumps somewhere unexpected, the user can be left staring at the wrong spot.

A switch is a single large button for users with limited movement. The system scans options, and one click selects the highlighted one.

Switch users move through controls one step at a time, so a sensible tab order keeps the scan short and predictable.

With voice control, users say commands like click submit. It works best when buttons have clear, visible names that match speech.

Here is the unifying idea: every tool relies on your markup. Clean, meaningful HTML is what makes assistive tech work.

Assistive tech cannot guess intent. When you label a button or pick a real element, you hand these tools the meaning they need.

Pick the right tool for the job.

Screen readers speak, magnifiers enlarge, and switches scan, but they all depend on your markup. Write it well and the tools shine. 🚀