Transition to "height: auto;" & "display: none;" Using Pure CSS
Find out how to easily transition from “height: 0;” to “height: auto;” and “display: none;” to “display: block;” without any hacks, tricks, or JavaScript, using only new CSS features: calc-size() function, transition-behavior property and @starting-style at-rule.
UPDATE: The calc-size() function no longer supports a single argument; it works only as a two-argument form. The first argument is the basis, and the second argument is the calculation, where the passed basis argument is available as the "size" keyword. So all examples in the video should be "calc-size(auto, size)" instead of "calc-size(auto)".
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📖 Chapters
00:00 About CSS transitions & demo setup
01:26 How to transition to height: auto;
04:06 How to transition from display: none
04:43 How transition-behavior CSS property works
06:32 How @starting-style at-rule works
08:34 Browser support for transition-behavior & @starting-style
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