Intermediate LevelCSS & Modern Layouts
What is the complete CSS cascade priority order including layers and !important?
❓ Interview Prompt: Explain the full cascade priority including origin, layers, specificity, and !important reversal.
The complete cascade order (lowest to highest priority):
1
User agent (browser) default styles
2
User stylesheets (accessibility overrides)
3
Author stylesheets: @layer (declared order)
4
Author stylesheets: un-layered styles
5
Author inline styles (
style="")6
Author
!important declarations (reversed layer order!)7
User
!important declarations8
User agent
!importantCritical: !important Reversal
Inside @layer, !important reverses layer priority. An !important rule in an earlier layer beats an !important in a later layer. This was designed so CSS resets can guarantee base styles are never overridden.
Code Implementation Example
css
@layer base, components;
/* In normal cascade: components > base */
@layer base { a { color: blue; } }
@layer components { a { color: red; } } /* red wins */
/* With !important: base > components (reversed!) */
@layer base { a { color: blue !important; } } /* blue wins */
@layer components { a { color: red !important; } }💡!important reverses layer priority order.
🎯 Interview Key Takeaway
!important reverses @layer priority order. Earlier layer !important beats later layer !important.
#Cascade#Specificity#Layers#Intermediate
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