To answer the immediate question, I had a look and nooope, no <a name="">, not even <a> anywhere, that I could find. However I just (begrudgingly) realized this

To answer the immediate question, I had a look and nooope, no <a name="">, not even <a> anywhere, that I could find. However I just (begrudgingly) realized this is somewhere text fragments can shine: https://leanpub.com/phptherightway#:~:text=Getting%20Started https://leanpub.com/phptherightway#:~:text=Getting%20Started To answer the bigger-picture question, the first thing I see (the above-the-fold part) upon loading the page (on both desktop and mobile) is a stylized ToC.