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To run a quick check on a website, you can use WebAIM’s Web Accessibility Evaluation Tool: WAVE tool. Simply paste the URL into the box and run the report. Look to see that section titles are appropriately marked with headings. You can also use WAVE to check that alt text is present for images.
Usability is a measure of how easy a system is to use. Accessibility means access to all, regardless of technological and physical means. This ranges from people with screen readers to those with mobile phones, PDAs or slow modems.