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Equal sign vs. colon
Defining img names and alternate attributes on the about.html page, one should use an equal sign. In defining an attribute in the css page (e.g., display: block;) one uses a colon.
Is there a simple rule for which to use in which occasion? Is it enough to say that you use an equal sign in html, and a colon in css?
Pretty much, it is language dependent. For example, in CSS, it's always a colon. In HTML, it's always an equal sign unless you're using inline or internal CSS (which you should never do). As you learn more languages, you'll learn how attributes and variables are assigned values for the language.