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Rules
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formatting
identification
images and media
internationalization
links
performance and compatibility
rights management
structure and code
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Links
39
Every link includes a text label in the source code
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40
Each link label describes its function or the nature of the target content
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41
Ensure links with the same function have consistent colors, styles, and behaviors across all documents
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42
Reserve underlining for links.
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43
Links are visually distinct from the surrounding text
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44
Distinguish between visited and unvisited link styles
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45
Internal and external links are clearly distinguished
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46
Links triggering external applications use descriptive labels
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47
Downloadable file formats are indicated
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48
Indicate the size of downloadable files
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49
The language of downloadable files is specified when it differs from the page language
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50
Downloadable file names identify the content and the source
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51
All internal links in the ebook are valid
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