Is it possible to make our site content, at least accessible in all conditions?
Yes it is. What makes HTML well-designed for this is that using semantic markup correctly means you donโt have to think about all the cases that you specify individually.
I find it useful to consider the most difficult cases. If the user does not see and hear and wants or wants to use the braille device to browse the web , can they use your website? If the user is quadriplegic and needs to navigate the web pages using a sound input and output device , can they use your website? In each case, does your website provide them with the best experience they can get?
Cover these cases, add a few basic principles, such as ensuring adequate color contrast, make your website functionally rich and attractive at your discretion for your regular users, and you should find that support for the to-do list you can leave devices for providing appropriate accessibility support.
Read, understand and use WCAG 2.0 and WAI-ARIA. You will get a much better idea of โโthe methods you need than asking individual SO questions.
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