The point is, you can just as well hide directives in special attributes, and then you’re guaranteed not to break HTML syntax rules and you can provide default content without the massive verbosity of bracketing it with special comments on both sides.

HTML-escaping is definitely the engine’s business. Why do you think are cross-site scripting attacks so common? Because everyone eventually forgets to escape something; or is just lazy. But only a vanishing minority of cases ever requires output to be printed unescaped. Good defensive programming sense then demands that escaping should be the default.

As for Petal and others doing the same tasks over and over, how is that relevant? You don’t have to choose to follow their implementation if you follow their language design.

Makeshifts last the longest.

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