'Why tailwind css is not shown in the DevTools?

Using Chrome's DevTools, I look at an element like <div class="w-10"></div> and I see this in styles tab:

But when I click on the styles.css:3, I don't see the CSS class and properties, all I see is my original CSS content:

@tailwind base;
@tailwind components;
@tailwind utilities;

Why does it work like that? What new knowledge do I miss that I don't understand this?

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