switchable css dark theme in js & html custom element

switchable css dark theme in js & html custom element

dark theme / dark mode

https://codepen.io/xgqfrms/pen/rNxWzzg

1turn === 360deg === 2𝞹 rad

pi symbol 𝞹 === 3.14159269793

https://en.wikipedia.org/wiki/Pi

弧度 rad = 360deg / PI

css units convertor

https://developer.mozilla.org/en-US/docs/Web/CSS/rotate

https://developer.mozilla.org/en-US/docs/Learn/CSS/Building_blocks/Values_and_units

https://developer.mozilla.org/en-US/docs/Web/CSS/angle

https://sabe.io/tools/css-unit-conversion-calculator

refs

https://www.cnblogs.com/xgqfrms/p/13054524.html

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