All bites
The whole library, newest first. Filter by what you are here for, or pick a topic if you already know.
4247 bites
Page 145
CSS Margin Collapsing: The Largest Margin Wins
Instead of adding up, vertical margins on adjacent block elements 'collapse' into one, taking the size of the largest margin. This explains why two paragraphs with margin: 1rem don't have 2rem of space between them. The footgun is assuming it's a bug.
CSS Pseudo-elements: Styling Parts of an Element
Pseudo-elements style parts of an element not in the DOM, like a paragraph's first line or selected text. Use ::before/::after for decorative content or ::selection to style user highlights.
CSS Stacking Contexts: The Z-Axis Explained
A CSS stacking context is like a self-contained group of layers. Elements inside only compete for z-index with siblings in that same group. They're created by properties like position with z-index, opacity, or transform.
Block Formatting Context: Taming Floats and Margins
A Block Formatting Context (BFC) is a mini-layout sandbox on your page, isolating its contents. Use it to contain child floats that would otherwise overflow their parent, or to stop adjacent elements from collapsing their margins.
CSS Containing Block: The Box That Defines Your Box
An element's size and position are calculated relative to its containing block, not always its direct parent. This determines how percentage widths are resolved and provides the reference for position: absolute.
CSS Color Values: From Keywords to Functions
CSS offers multiple ways to define colors, from simple names like red to functions like rgb(). Use keywords for mockups, hex for design handoffs, and HSL for intuitive manipulation. The main footgun: colors can look different across uncalibrated devices.
CSS `font`: The All-in-One Typography Shorthand
The font property is a single CSS declaration for setting multiple type styles at once, like size, weight, and family. Use it to define base typography for your site or components.
CSS `background`: The All-in-One Shorthand
The CSS background property is a shortcut for styling an element's backdrop, combining color, image, and position in one line. Use it for most background tasks, from simple colors to complex layered images.
border-radius: More Than Just Rounded Corners
The border-radius property rounds an element's corners, used for everything from buttons to circular avatars. The footgun is its shorthand syntax: one value is simple, but two, three, or four values follow specific clockwise rules that are easy to mix up.
@font-face: Ship Custom Fonts with Your CSS
@font-face lets you use fonts not installed on a user's machine by telling the browser where to download them. It's how you get custom brand fonts on a website, but be wary of the performance hit from downloading large font files.
CSS Gradients: Dynamic Images from Code
Think of CSS gradients as dynamic images generated by the browser, creating color transitions without a separate file. Use them for backgrounds and buttons. The default direction is top-to-bottom, but a 0deg angle is counterintuitively bottom-to-top.
CSS box-shadow: Creating Depth and Elevation
box-shadow fakes depth by casting a shadow from an element's frame. It's used to elevate UI like cards and modals or create inner shadows for pressed states. The footgun: omitting the color causes it to inherit the parent's text color, not black.
CSS text-shadow: Adding Depth and Legibility to Text
The text-shadow property adds depth to text, like casting a shadow from a light source. Use it for subtle emphasis, letterpress effects, or to make text readable on busy backgrounds. The footgun: not setting a color, as browser defaults vary widely.
Stacking Multiple Backgrounds in CSS
Think of CSS backgrounds as a stack of transparent sheets where the first image listed is on top. This lets you layer logos over gradients or combine patterns without extra HTML. The footgun: the first image in the code is the frontmost on screen.
Variable Fonts: One File, Infinite Styles
Variable fonts pack an entire typeface's variations—from thin to bold, condensed to wide—into a single file. This avoids multiple HTTP requests for different font weights, giving you a continuous range of styles with CSS.
CSS Filter: Photoshop-like Effects in the Browser
The filter property brings Photoshop-like graphical effects directly into CSS. Use it for image adjustments like blur() or contrast(), or for complex shadows with drop-shadow(). The order of chained filters matters, as they are applied sequentially.
CSS Blend Modes: Photoshop Effects in the Browser
Think Photoshop layer effects, but in CSS. Blend modes define how overlapping element colors interact—multiplying or screening them for rich effects. Use them for text knockouts on images or complex background textures.
CSS clip-path: Break Out of the Box
Use clip-path to create non-rectangular layouts by defining a visible region, like a cookie cutter for your elements. It's perfect for complex UI shapes like chevrons or circles without extra image files. The footgun: complex shapes have tricky syntax.
backdrop-filter: Styling What's Behind an Element
Think of backdrop-filter as frosted glass for your UI. It applies graphical effects like blur to the content *behind* an element. It's ideal for overlays like modals or navigation bars to improve legibility.
CSS Flexbox: Mastering the Main and Cross Axis
Flexbox treats layout as a one-dimensional problem: either a row or a column. All alignment rules operate along a 'main axis' and a perpendicular 'cross axis'. Use it for navbars or card components.