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Ivan Frances Alcantara4,516 Points
Why are <blockquote>s (l. 62 & l. 65) indented from <h3> (l. 59)?
Paragraphs like the one in line 27 are not indented from their titles, neither are they indented from <headers> like that in l. 44, but then <blockquotes> are, and same for <ul> in l. 31.
Steven Parker210,475 Points
Indentation is being used here to indicate the nesting level of elements. The paragraphs and their titles are "sibling" elements (have the same parent), so they are indented the same amount.
Spacing and indentation of HTML elements is entirely to enhance readability, it has no effect on the rendered output. But because it helps to make the organization more clear, it is considered a "best practice".