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HTML/CSSBeginner#seo#html
HTML/CSSIntermediate#accessibility
What is keyboard accessibility and how do you test for it?
It means every interactive element (links, buttons, forms, custom widgets) can be reached and operated using only the keyboard (Tab, Shift+Tab, Enter, Space, arrows). Test by tabbing through the whole page and verifying visible focus indicators and logical order.
Example
/* Never remove focus outlines without a replacement */
button:focus-visible {
outline: 2px solid #2563eb;
outline-offset: 2px;
}