Textual Information - 1194.21(f)
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The key here is that I use the word textual, because so often a pdf file will be on the screen and your average person does not understand why that is an inaccessible document. It is clean text. But we know that it is not real, what we call computer text; it is basically a picture of text. But it is textual information, and that is why it says textual specifically. Another area where you might see this and I'm going to show you on a website, where a whole page is totally inaccessible because it is nothing but graphics and print, or graphics that is printed on. Embedding text as part of a picture is textual information, but it is not text, not ASCII text.
So, the only way that we could really put any regulatory affect on this was to say that they must provide text using the operating system provided tools for writing to the screen. The reason is that different programs come up with different ways. They don't always want to use the computer base, but they come up with something else. This is similar to the program that we were discussing that ignored high contrast, because they had their own display driver. If the text of that program was not sent through the operating system, then no assistive technology would be able to read it.