Notes for myself:
spoiler box: https://toyhou.se/~forums/16.htmlcss-graphics/40588.help-needed-spoiler-box?page=#post-1125973
code as text: https://toyhou.se/~forums/16.htmlcss-graphics/197270.how-to-display-code-as-text-?page=#post-3237093
select all text: https://toyhou.se/~forums/16.htmlcss-graphics/197270.how-to-display-code-as-text-?page=#post-3237093
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