a markup language describes a structure (how is the thing supposed to be displayed)
A markup language does not define how something is to be displayed, that’s what a styling language is for (usually CSS). A markup language semantically defines what certain parts of the created document are.
Especially the last one might cause the most work, because the “modern web development environment” simply cannot provide this. Also: form-action ‘none’; should be validated. It should be set to self if forms are actually used to send data to the server and not handled by Javascript.
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