gohugoio-hugo/docs/content/en/functions/htmlEscape.md

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title	linktitle	description	godocref	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated	aliases
htmlEscape		Returns the given string with the reserved HTML codes escaped.		2017-02-01	2017-02-01	2017-02-01	functions	docs parent functions	strings html	htmlEscape INPUT			htmlUnescape	false

In the result & becomes & and so on. It escapes only: <, >, &, ' and ".

{{ htmlEscape "Hugo & Caddy > WordPress & Apache" }} → "Hugo & Caddy > WordPress & Apache"