CSS Popover + Anchor Positioning is Magical

If you’ve ever needed the positioning of an element to be connected (or anchored) to the position of another element, then you’ll be very excited about anchor positioning in CSS! It is new (as of the time of recording), but thankfully, we have a really good Polyfill, so we don’t have to worry about browser support!

🔗 Links

✅ Code from this video: https://codepen.io/kevinpowell/pen/poMaLjR??editors=1100 (slightly different, and no polyfill being used here)

✅ Chrome for Developers blog article on anchor positioning: https://developer.chrome.com/blog/anchor-positioning-api

✅ MDN on Anchor Positioning: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_anchor_positioning

✅ Popover Polyfill: https://github.com/oddbird/popover-polyfill

✅ Anchor positioning polyfill: https://github.com/oddbird/css-anchor-positioning

✅ Browser support for popover: https://caniuse.com/mdn-api_htmlelement_popover

✅ Browser support for anchor positioning: https://caniuse.com/css-anchor-positioning

✅ I’ve got courses! https://kevinpowell.co/courses

⌚ Timestamps

00:00 - Introduction

00:33 - Turning our element into a popover

02:05 - Only change the display value when the popover is opened

03:25 - A few user agent styles you’ll probably want to overwrite

04:40 - Creating an anchor, and connecting an element to it

06:20 - Using the new anchor() function to position the element where you want

08:20 - Polyfills

10:15 - Change the positioning of the element when it runs out of room with @position-try

13:50 - Semantics

14:50 - Fading the out with allow-discrete

18:20 - Fading the menu in with @starting-style

#css

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