Correction in the thumbnail: This video was shot on April 2023

• It's not HTML5 or CSS3 - it's just 'html' and 'css'!
• https://developer.mozilla.org/en-US/docs/Web/HTML - Good documentation but not the spec!
• https://html.spec.whatwg.org/
• Content model - What is legal to nest
• Transparent: a > h1 is ok, but p > a > h1 not ok!
• https://caninclude.glitch.me/
• preload preconnect prefetch prerender for links
• Get your head straight: https://www.youtube.com/watch?v=UW1PEMBdX5E
• <header><main><footer> are important!
• Subheading <hgroup><h1><p> - Not <hgroup><h1><h2>
• Upgrade Your HTML (4 books)
• <menu> - like <ul>
• script - defer async type="module" nomodule
• <template id="mytable"> - Don't have to put html in javascript
• JavaScript is expensive, HTML is almost free!