'id' is only to be used once on each page, whereas 'class' may be used repeatedly (or only once).
Despite proof-reading it twice, I missed a major blunder : I was referring to each specific 'id', such as "nav". Therefore the sentence should have read:
Each 'id' is only to be used once on each page, whereas each 'class' may be used repeatedly (or only once).
Ugh. I'm going for more coffee
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