This is something we should definitely strive for, absolutely - although you are right with the help of web interfaces that it can be especially difficult. All this relates to focus management and processing of keyboard events, which require additional time and effort on the part of the developer, but there are many people (and not just disabled ones) who will thank you for the care you are sure that your web projects, at least are practically affordable and suitable for use without the need for a mouse.
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