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Languages & runtimes · #css3
Learn how to define, scope, and safely use CSS custom properties with fallback values, plus common mistakes to avoid.
A decision guide comparing CSS Flexbox and CSS Grid for building a responsive card component, with constraints, a compact comparison table, trade‑offs, concrete code examples, and a validation checklist.
When grid-template-areas omit cells, browsers create implicit tracks that shift layouts. This guide shows how to define explicit tracks, test with DevTools, and fall back for non-Grid browsers.
Learn how CSS Grid’s auto‑fit and minmax create responsive card columns that adapt to any viewport, with a worked example and notes on when Flexbox is a better fit.
Learn how to create a responsive two‑column layout using CSS Grid, define explicit tracks with fr units, and verify the result in the browser.
Stop fighting with floats and nested divs. Learn how CSS Grid Template Areas allow you to visually map your page layout and rearrange it for mobile with minimal code.
Use CSS Grid as the primary layout engine, wrap it in a feature query, and provide a lightweight block‑flow fallback to support legacy browsers without breaking the design.
Goal: Understand how the CSS @property rule should behave when a later declaration re‑defines the same custom property with a different syntax value, particularly whether the property’s value must be reset to its initial value to avoid duplicated writes in animation worklets. Uncertainty: The current specification does not define the interaction between casc
Goal Maintain a responsive image container that preserves a 16:9 aspect ratio across all target browsers. Constraints & Uncertainty Modern browsers support aspect-ratio , eliminating the need for pseudo‑elements or JavaScript. However, legacy browsers (IE, legacy Edge) lack this feature, necessitating a fallback. The padding‑top hack, while widely suppor