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Optional #HTML: Everything You Need to Know: meiert.com/en/blog/optional-html/. Optional HTML can be left out to improve #performance, to guide code #comprehension, and to hone the #craft. All optional tags, rules around quotes for attribute values, omissible attribute value defaults, &c.
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Nun auch auf Deutsch: Optionales #HTML: Alles, was man wissen muss: meiert.com/de/publications/articles/20191218/.