Styles are not injected inside a <style></style>, nor in the style attribute, but are injected inside a shared instance of CSSStyleSheet adopted by the shadow root (if using it) and the outer root (light or shadow) of the element.
Every time the style is recalculated, the style for the unique class name, calculate using only the CSS text of the parsed style, is injected in the CSSStyleSheet if not present.
As a plus, not only instances of the same component, share the same set of class names, but also different element with equals parsed CSS string.
Well, if the instances share the same styles, how are you able to reactively change the styles based on props ? The styles for all instances would change based on props passed to a single instance ?
An unique class name, based on the style, is created and added to the element every time props changes. The old class name if present is removed.
Take a look at the code.
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This creates copies of your styles in each instance of the component. Hence not reccommended
This is not true.
Styles are not injected inside a
<style></style>, nor in thestyleattribute, but are injected inside a shared instance ofCSSStyleSheetadopted by the shadow root (if using it) and the outer root (light or shadow) of the element.Every time the style is recalculated, the style for the unique class name, calculate using only the CSS text of the parsed style, is injected in the CSSStyleSheet if not present.
As a plus, not only instances of the same component, share the same set of class names, but also different element with equals parsed CSS string.
For example:
The instances of the three styled-components share the same class name.
Well, if the instances share the same styles, how are you able to reactively change the styles based on props ? The styles for all instances would change based on props passed to a single instance ?
An unique class name, based on the style, is created and added to the element every time props changes. The old class name if present is removed.
Take a look at the code.