I am a subscriber to Safari Online. I have found that for the book Learning Bootstrap 4, 2nd Edition, Chapter 4 does not load. In the table of contents, all sections of this chapter are "greyed out."
Is this by design?
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I looked into this and I'm not seeing that chapter greyed out. I was able to click on the sections of Chapter 4 of that book and get to those pages. I've attached a screenshot of how Chapter 4 looks to me in the TOC.
I would recommend clearing your cache and cookies and try again, or maybe try a different browser.
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