{ "summary": { "verified": 104, "unavailable": 58, "total": 162 }, "topics": { "verified": [ { "id": "what-is-css", "title": "What is CSS?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "what-does-css-stand-for", "title": "What does CSS stand for?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "why-is-css-used", "title": "Why is CSS used?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "what-are-the-advantages-of-css", "title": "What are the advantages of CSS?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "what-are-the-different-types-of-css", "title": "What are the different types of CSS?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "difference-between-inline-internal-and-external-css", "title": "Difference between inline, internal, and external CSS?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-cascade-6/" ] }, { "id": "what-is-a-selector-in-css", "title": "What is a selector in CSS?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-universal-selectors", "title": "What are universal selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-element-selectors", "title": "What are element selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-class-selectors", "title": "What are class selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-id-selectors", "title": "What are ID selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "difference-between-class-and-id", "title": "Difference between class and ID?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-grouping-selectors", "title": "What are grouping selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-combinator-selectors", "title": "What are combinator selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-is-the-box-model-in-css", "title": "What is the box model in CSS?", "category": "Box Model", "sources": [ "https://www.w3.org/TR/css-box-4/" ] }, { "id": "what-is-margin-in-css", "title": "What is margin in CSS?", "category": "Box Model", "sources": [ "https://www.w3.org/TR/css-box-4/" ] }, { "id": "what-is-padding-in-css", "title": "What is padding in CSS?", "category": "Box Model", "sources": [ "https://www.w3.org/TR/css-box-4/" ] }, { "id": "difference-between-margin-and-padding", "title": "Difference between margin and padding?", "category": "Box Model", "sources": [ "https://www.w3.org/TR/css-box-4/" ] }, { "id": "what-is-border-in-css", "title": "What is border in CSS?", "category": "Box Model", "sources": [ "https://www.w3.org/TR/css-box-4/" ] }, { "id": "what-are-css-units", "title": "What are CSS units?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "difference-between-px-em-rem-and-percent", "title": "Difference between px, em, rem, and %?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-is-display-property", "title": "What is display property?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "difference-between-block-and-inline-elements", "title": "Difference between block and inline elements?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-inline-block", "title": "What is inline-block?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-position-property", "title": "What is position property?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "difference-between-relative-and-absolute-positioning", "title": "Difference between relative and absolute positioning?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "difference-between-fixed-and-sticky-positioning", "title": "Difference between fixed and sticky positioning?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-z-index", "title": "What is z-index?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-overflow-in-css", "title": "What is overflow in CSS?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-float-in-css", "title": "What is float in CSS?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-clear-property", "title": "What is clear property?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-display-3/", "https://www.w3.org/TR/css-position-3/", "https://www.w3.org/TR/css-overflow-3/" ] }, { "id": "what-is-flexbox", "title": "What is flexbox?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-flexbox-1/" ] }, { "id": "what-is-grid-layout", "title": "What is grid layout?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-grid-2/" ] }, { "id": "difference-between-flexbox-and-grid", "title": "Difference between flexbox and grid?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-flexbox-1/", "https://www.w3.org/TR/css-grid-2/" ] }, { "id": "what-is-background-property", "title": "What is background property?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-is-opacity-in-css", "title": "What is opacity in CSS?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-is-visibility-property", "title": "What is visibility property?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "difference-between-display-none-and-visibility-hidden", "title": "Difference between display:none and visibility:hidden?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-are-pseudo-classes", "title": "What are pseudo-classes?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-pseudo-elements", "title": "What are pseudo-elements?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "difference-between-pseudo-class-and-pseudo-element", "title": "Difference between pseudo-class and pseudo-element?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-is-hover-effect", "title": "What is hover effect?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-is-transition-in-css", "title": "What is transition in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transitions-1/", "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "what-is-animation-in-css", "title": "What is animation in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transitions-1/", "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "what-are-media-queries", "title": "What are media queries?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-responsive-design", "title": "What is responsive design?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-specificity-in-css", "title": "What is specificity in CSS?", "category": "Cascade", "sources": [ "https://www.w3.org/TR/css-cascade-6/" ] }, { "id": "what-is-inheritance-in-css", "title": "What is inheritance in CSS?", "category": "Cascade", "sources": [ "https://www.w3.org/TR/css-cascade-6/" ] }, { "id": "what-are-css-variables", "title": "What are CSS variables?", "category": "Cascade", "sources": [ "https://www.w3.org/TR/css-variables-2/" ] }, { "id": "how-do-you-center-a-div", "title": "How do you center a div?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-flexbox-1/" ] }, { "id": "what-is-css3", "title": "What is CSS3?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "features-of-css3", "title": "Features of CSS3?", "category": "CSS Fundamentals", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "what-is-transform-property", "title": "What is transform property?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transforms-2/" ] }, { "id": "what-is-translate-in-css", "title": "What is translate in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transforms-2/" ] }, { "id": "what-is-rotate-in-css", "title": "What is rotate in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transforms-2/" ] }, { "id": "what-is-scale-in-css", "title": "What is scale in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transforms-2/" ] }, { "id": "what-is-skew-in-css", "title": "What is skew in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transforms-2/" ] }, { "id": "what-is-transition-timing-function", "title": "What is transition timing function?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transitions-1/", "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "what-is-keyframes-in-css", "title": "What is keyframes in CSS?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transitions-1/", "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "difference-between-transition-and-animation", "title": "Difference between transition and animation?", "category": "Transforms and Motion", "sources": [ "https://www.w3.org/TR/css-transitions-1/", "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "what-is-calc-function", "title": "What is calc() function?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-is-clamp-function", "title": "What is clamp() function?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-are-gradients-in-css", "title": "What are gradients in CSS?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "difference-between-linear-and-radial-gradients", "title": "Difference between linear and radial gradients?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-is-object-fit", "title": "What is object-fit?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-is-object-position", "title": "What is object-position?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-is-aspect-ratio", "title": "What is aspect-ratio?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-backgrounds-3/", "https://www.w3.org/TR/css-color-4/", "https://www.w3.org/TR/css-images-4/" ] }, { "id": "what-are-css-filters", "title": "What are CSS filters?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/filter-effects-1/" ] }, { "id": "what-is-backdrop-filter", "title": "What is backdrop-filter?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/filter-effects-1/" ] }, { "id": "what-are-css-counters", "title": "What are CSS counters?", "category": "Visual Styling", "sources": [ "https://www.w3.org/TR/css-lists-3/" ] }, { "id": "what-is-nth-child-selector", "title": "What is nth-child selector?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-is-nth-of-type-selector", "title": "What is nth-of-type selector?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-are-attribute-selectors", "title": "What are attribute selectors?", "category": "Selectors", "sources": [ "https://www.w3.org/TR/selectors-4/" ] }, { "id": "what-is-viewport-unit", "title": "What is viewport unit?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-is-vh-and-vw", "title": "What is vh and vw?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-is-min-width-and-max-width", "title": "What is min-width and max-width?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-sizing-3/" ] }, { "id": "what-is-min-height-and-max-height", "title": "What is min-height and max-height?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-sizing-3/" ] }, { "id": "what-is-rem-unit", "title": "What is rem unit?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-is-em-unit", "title": "What is em unit?", "category": "Values and Units", "sources": [ "https://www.w3.org/TR/css-values-4/" ] }, { "id": "what-is-lazy-loading-in-css", "title": "What is lazy loading in CSS?", "category": "Performance", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "what-is-mobile-first-design", "title": "What is mobile-first design?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-desktop-first-design", "title": "What is desktop-first design?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-responsive-typography", "title": "What is responsive typography?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-cssom", "title": "What is CSSOM?", "category": "Browser Rendering", "sources": [ "https://www.w3.org/TR/cssom-1/" ] }, { "id": "what-are-stacking-contexts", "title": "What are stacking contexts?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-position-3/" ] }, { "id": "what-causes-stacking-context", "title": "What causes stacking context?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-position-3/" ] }, { "id": "what-is-contain-property", "title": "What is contain property?", "category": "Performance", "sources": [ "https://www.w3.org/TR/css-contain-3/" ] }, { "id": "what-is-will-change-property", "title": "What is will-change property?", "category": "Performance", "sources": [ "https://www.w3.org/TR/css-will-change-1/" ] }, { "id": "what-are-custom-properties", "title": "What are custom properties?", "category": "Cascade", "sources": [ "https://www.w3.org/TR/css-variables-2/" ] }, { "id": "what-is-container-query", "title": "What is container query?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/css-contain-3/" ] }, { "id": "what-are-subgrid-layouts", "title": "What are subgrid layouts?", "category": "Layout", "sources": [ "https://www.w3.org/TR/css-grid-2/" ] }, { "id": "what-are-css-feature-queries", "title": "What are CSS feature queries?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/css-conditional-5/" ] }, { "id": "what-is-prefers-color-scheme", "title": "What is prefers-color-scheme?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-prefers-reduced-motion", "title": "What is prefers-reduced-motion?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "what-is-print-css", "title": "What is print CSS?", "category": "Responsive and Accessibility", "sources": [ "https://www.w3.org/TR/css-page-3/" ] }, { "id": "how-do-you-center-elements-vertically-and-horizontally", "title": "How do you center elements vertically and horizontally?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-flexbox-1/" ] }, { "id": "how-do-you-create-a-sticky-header", "title": "How do you create a sticky header?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-position-3/" ] }, { "id": "how-do-you-implement-dark-mode", "title": "How do you implement dark mode?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "how-do-you-optimize-css-performance", "title": "How do you optimize CSS performance?", "category": "Performance", "sources": [ "https://www.w3.org/TR/css-2025/" ] }, { "id": "how-do-you-handle-responsive-layouts", "title": "How do you handle responsive layouts?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-grid-2/", "https://www.w3.org/TR/mediaqueries-5/" ] }, { "id": "how-do-you-create-animations", "title": "How do you create animations?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "how-do-you-create-a-loading-spinner", "title": "How do you create a loading spinner?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-animations-1/" ] }, { "id": "how-do-you-build-responsive-cards", "title": "How do you build responsive cards?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-grid-2/", "https://www.w3.org/TR/css-values-4/" ] }, { "id": "how-do-you-create-a-css-grid-layout", "title": "How do you create a CSS grid layout?", "category": "Practical CSS", "sources": [ "https://www.w3.org/TR/css-grid-2/" ] } ], "unavailable": [ { "id": "what-is-bem-methodology", "title": "What is BEM methodology?", "category": "Unverified", "sources": [] }, { "id": "what-is-css-reset", "title": "What is CSS reset?", "category": "Unverified", "sources": [] }, { "id": "what-is-normalize-css", "title": "What is normalize.css?", "category": "Unverified", "sources": [] }, { "id": "what-is-css-sprite", "title": "What is CSS sprite?", "category": "Unverified", "sources": [] }, { "id": "what-are-css-frameworks", "title": "What are CSS frameworks?", "category": "Unverified", "sources": [] }, { "id": "what-is-bootstrap", "title": "What is Bootstrap?", "category": "Unverified", "sources": [] }, { "id": "what-is-tailwind-css", "title": "What is Tailwind CSS?", 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