The button content type allows you to create accessible and defined links to external content within a page or book section:

This button has no link

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In your text editor, this button content looks as follows: 

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• the link text should be the full html address of your chosen link: link="https://somewebsite.com"
• the link colour can be set via the "type" indicator as follows: 
  • primary primary
  • success success
  • warning warning
  • info info
  • inverse inverse
• the button size can be set to "lg", "sm", or "xs" - the default, shown in this list here, is "sm"

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You can also use the button feature to create a formatted link text as seen here: 

This is a link using button type "link"

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In your text editor this content appears like this: