In Chapter 2, the author adds the following line to create a hyperlink
<p><a href="#" onclick="alert('Hello !');">Inline alert()</a></p>
Without the href clause, the text "Inline alert" would be rendered
merely as plain text rather than as a hyperlink, so there would be
nothing to click on to raise the "onclick" event.
But the '="#"' portion of that clause seems to be superfluous, at
least in my Firefox browser, ver. 126.96.36.199. If the subject portion is
not superfluous, how is it to be interpreted?