[neilv]

For also viewing and editing these Markdown files from Emacs, you can get semi-WYSIWYG there. Especially if you take advantage of Emacs "fill" features, such as for making nested bulleted/numbered lists readable.

    (setq-default fill-column 79)

    (global-set-key (kbd "C-'") #'imenu-list-smart-toggle)

    (autoload 'markdown-mode "markdown-mode" nil t)

    (autoload 'imenu-list              "imenu-list" nil t)
    (autoload 'imenu-list-minor-mode   "imenu-list" nil t)
    (autoload 'imenu-list-noselect     "imenu-list" nil t)
    (autoload 'imenu-list-smart-toggle "imenu-list" nil t)

    [...]

    (custom-set-variables
     [...]
     '(markdown-hide-urls t)
     [...])

    ;; Note: These face colors assume black-on-white normal colors.
    (custom-set-faces
     [...]
     '(markdown-blockquote-face ((t (:inherit nil :background "gray95" :foreground "gray25"))))
     '(markdown-bold-face ((t (:inherit nil :slant normal :weight bold))))
     '(markdown-header-delimiter-face ((t (:inherit markdown-markup-face))))
     '(markdown-header-face ((t (:inherit nil :weight bold :family "sans"))))
     '(markdown-header-face-1 ((t (:inherit markdown-header-face :height 2.0))))
     '(markdown-header-face-2 ((t (:inherit markdown-header-face :height 1.6))))
     '(markdown-header-face-3 ((t (:inherit markdown-header-face :height 1.2))))
     '(markdown-header-face-4 ((t (:inherit markdown-header-face :height 1.1))))
     '(markdown-header-face-5 ((t (:inherit markdown-header-face :height 1.0))))
     '(markdown-highlight-face ((t (:foreground "blue" :underline t))))
     '(markdown-html-attr-name-face ((t (:inherit markdown-markup-face))))
     '(markdown-html-attr-value-face ((t (:inherit markdown-markup-face))))
     '(markdown-html-tag-name-face ((t (:inherit markdown-markup-face))))
     '(markdown-inline-code-face ((t (:inherit nil :foreground "green4"))))
     '(markdown-italic-face ((t (:inherit nil :slant italic :weight normal))))
     '(markdown-language-keyword-face ((t (:foreground "gray80"))))
     '(markdown-link-face ((t (:inherit nil :foreground "blue3"))))
     '(markdown-list-face ((t (:inherit nil :weight bold))))
     '(markdown-pre-face ((t (:inherit markdown-inline-code-face :background "#f4fff4"))))
     '(markdown-reference-face ((t (:weight bold))))
     '(markdown-strike-through-face ((t (:inherit nil :strike-through t))))
     '(markdown-table-face ((t (:inherit nil :background "#fafafa"))))
     '(markdown-url-face ((t (:inherit markdown-markup-face))))
     [...])