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1. Alternate web pages should be provided when pages presented to users may include content that may not allow usability of, or access to content. Examples of pages which may hinder accessibility include those with:
2. Also, ensure that alternate pages created to make the inaccessible pages accessible are updated simultaneously with the original page. (Equivalents for content are to be updated when the primary content changes)
See: Example 2 | More on Alternate Pages | More W3C Examples
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Cascading style sheets
Often pages cannot be understood and/or navigated without applying style specifications.
Organize documents so they may be read without style sheets. For example, when an HTML document is rendered without associated style sheets, it must still be possible to read the document. Otherwise, provide an alternate, accessible page.
Frames
Not all browsers recognize frames. Provide alternate, accessible pages to convey the same content -- without the frames. To accomplish this, the NOFRAMES tag could be used in the frames content page. See Example 2 for more details.
Programmatic objects (tags: scripts, applets, object)
Not all browsers recognize all program objects. Provide alternate, accessible pages to convey the same content -- without the program objects.
Color-dependent content
Information conveyed within a page may rely on the color of text -- color-coded content. Users unable to distinguish between colors will not be able to access such a page. Ensure that all information conveyed with color is also available without color. Otherwise, provide an alternate, accessible page.
Indistinguishible colors
A page may use colors that do not provide distinquishable contrast between foreground and background colors.