This that
Then the result of evaluating the expression (libxml-parse-html-region (mark) (point) nil t) is (html nil (body nil (p nil "This " (comment nil " and ") " that"))) and the result of evaluating the expression (libxml-parse-xml-region (mark) (point) nil t) is (p nil "This " (comment nil " and ") " that") In both cases, I would expect that passing t as the fourth argument would cause the comments to be dropped, but they are not. Incidentally, I notice that the documentation for libxml-parse-xml-region includes the following sentence: If DISCARD-COMMENTS is non-nil, all HTML comments are discarded. I imagine this ought to refer to "XML comments" rather than "HTML comments." In GNU Emacs 26.0.50 (build 1, x86_64-apple-darwin13.4.0, NS appkit-1265.21 Version 10.9.5 (Build 13F1911)) of 2017-05-15 built on builder10-9.local Windowing system distributor 'Apple', version 10.3.1504 Recent messages: (html nil (body nil (p nil "this " (comment nil " and ") " that"))) [2 times] Auto-saving... funcall-interactively: Beginning of buffer (html nil (body nil (p nil "this " (comment nil " and ") " that"))) [2 times] Quit [4 times] Mark activated (p nil "this " (comment nil " and ") " that") uncompressing dom.el.gz...done Note: standard-indent adjusted to 2 Quit [3 times] Configured using: 'configure --with-ns '--enable-locallisppath=/Library/Application Support/Emacs/${version}/site-lisp:/Library/Application Support/Emacs/site-lisp' --with-modules' Configured features: NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Emacs-Lisp Minor modes in effect: recentf-mode: t global-anzu-mode: t anzu-mode: t volatile-highlights-mode: t dtrt-indent-mode: t projectile-mode: t elisp-slime-nav-mode: t diff-auto-refine-mode: t magit-auto-revert-mode: t global-git-commit-mode: t async-bytecomp-package-mode: t shell-dirtrack-mode: t google-this-mode: t global-flycheck-mode: t flycheck-mode: t minibuffer-depth-indicate-mode: t ido-everywhere: t global-undo-tree-mode: t undo-tree-mode: t paredit-mode: t override-global-mode: t show-paren-mode: t electric-pair-mode: t savehist-mode: t desktop-save-mode: t tooltip-mode: t global-eldoc-mode: t electric-indent-mode: t mouse-wheel-mode: t global-prettify-symbols-mode: t prettify-symbols-mode: t menu-bar-mode: t file-name-shadow-mode: t global-font-lock-mode: t font-lock-mode: t blink-cursor-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t line-number-mode: t transient-mark-mode: t Load-path shadows: None found. 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