(why) some html is "optional"

What are the options for (reverse) converting HTML to Markdown in 2020? https://github.com/feedreader/planet.rb 6 comments 28/1/2020 ruby

Google HTML Style Guide recommends to omit optional tags https://google.github.io/styleguide/htmlcssguide.html#optional_tags 3 comments 20/5/2019 web_design

What's the easiest option for a front-end designer to add/convert a static website (HTML+CSS+JS) to a CMS? https://www.reddit.com/r/webdev/comments/8w8mn0/whats_the_easiest_option_for_a_frontend_designer/ 5 comments 5/7/2018 webdev

TIL closing tags are optional for paragraph <p> elements in HTML http://stackoverflow.com/questions/8460993/p-end-tag-p-is-not-needed-in-html 69 comments 9/3/2017 webdev

free options for hosting a very simple HTML website? https://www.reddit.com/r/web_design/comments/5hn68g/free_options_for_hosting_a_very_simple_html/ 6 comments 10/12/2016 web_design

Googles HTML Styleguide – Omit Optional Tags https://google.github.io/styleguide/htmlcssguide.xml?showone=optional_tags#optional_tags 15 comments 17/9/2016 webdev

Ultralight is the lighter, faster option to integrate HTML UI in your C++ app. v1.0 Released today https://www.reddit.com/r/cpp/comments/b319dv/ultralight_is_the_lighter_faster_option_to/ 7 comments 19/3/2019 cpp

Ultralight is the lighter, faster option to integrate HTML UI in your C++ app. v1.0 Released today https://ultralig.ht/ 43 comments 19/3/2019 programming

1993 - I'd like to propose a new, optional HTML tag: IMG http://1997.webhistory.org/www.lists/www-talk.1993q1/0182.html 238 comments 15/7/2008 programming

Making a HUD type border, meaning it zig zags a little. Created it in figma, but when i place the svg in my html, i can't get it to be responsive. The height and width move in a set ratio. How do i make such a border, is svg the best option. https://elements.envato.com/technology-hud-frame-border-hud-element-NZMSMFE 4 comments 22/7/2023 webdev

I made a site that allows users to make posts and components while optionally editing the HTML & JS. Check out this question I spent way too long answering with a D3 visual representation of light waves https://www.formofgood.com/post/why-is-the-sky-blue 3 comments 12/7/2018 web_design

Recently I created a responsive, CSS-only navbar library and now I made an interactive, easy-to-use webtool where you can select the options and have a working HTML code in less than a minute. I'd love to get your opinions on it! https://balzss.github.io/luxbar/ 13 comments 18/2/2017 webdev

I want to build a mobile (iOS and Android) messaging app for as little possible money (I don't mind putting more work in to achieve that). I know the basics of html and CSS. I don't mind learning a new language. What are my options? https://www.reddit.com/r/learnprogramming/comments/5bpbqj/i_want_to_build_a_mobile_ios_and_android/ 9 comments 7/11/2016 learnprogramming