CSS Checker Example Report — Errors, Performance & Specificity Issues
This example shows the AIPageSEO CSS Checker for a marketing site stylesheet. The report finds 47 issues including a missing closing brace causing a cascade failure, 8 overuses of !important, missing focus styles and 3 non-composited animations that cause layout reflow.
Missing closing curly brace — line 847
A missing }} on line 847 causes all subsequent rules to be parsed incorrectly. This is a cascade failure — multiple styles will not apply as intended. Fix: Add the missing }} after the .hero-section rule on line 847.
@import rule not at top of stylesheet — line 234
@import inside a stylesheet that has already been parsed is ignored by some browsers. Move all @import rules to the very top of the CSS file, before any other rules. Better: replace @import with a <link> tag in HTML to allow parallel loading.
Missing semicolon after declaration — line 312
color: #ffffff is missing a semicolon, causing the next declaration to be silently dropped. Fix: Add semicolons after every CSS declaration.
3 non-composited animations (top, left, width)
Animating top, left and width properties forces layout reflow on every frame. Replace with transform: translate() and transform: scaleX() to use the GPU compositor and eliminate jank.
8 uses of !important — specificity conflicts
!important overrides the normal cascade and makes styles impossible to override cleanly. Refactor affected selectors to use proper specificity instead: .parent .child > div is more specific without !important.
outline: none on :focus without replacement
Removing focus outlines without providing an alternative makes the page completely unusable for keyboard users. Replace with outline: 2px solid var(--focus-color) or a box-shadow equivalent on all interactive elements.
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