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:placeholder-shown

The :placeholder-shown pseudo-class represents any form element displaying placeholder text.
CSS CSS Pseudo-class Reference

height

The height CSS descriptor is a shorthand descriptor for setting both min-height and max-height of the viewport. by providing one viewport length value will set both, the minimum height and the maximum height, to the value provided.
@viewport CSS CSS Descriptor Reference

max-height

The max-height CSS descriptor specifies the maximum height of the viewport of a document defined via the @viewport at-rule.
@viewport CSS CSS Descriptor Reference

max-width

The max-width CSS descriptor specifies the maximum width of the viewport of a document defined via the @viewport at-rule.
@viewport CSS CSS Descriptor Reference

min-height

The min-height CSS descriptor specifies the minimum height of the viewport of a document defined via the @viewport at-rule.
@viewport CSS CSS Descriptor Reference

min-width

The min-width CSS descriptor specifies the minimum width of the viewport of a document defined via @viewport.
@viewport CSS CSS Descriptor Reference

Adjacent sibling selectors

This is referred to as an adjacent selector or next-sibling selector. It will select only the specified element that immediately follows the former specified element.
CSS CSS Reference NeedsMobileBrowserCompatibility Selectors

box-sizing

The box-sizing property is used to alter the default CSS box model used to calculate width and height of the elements. It is possible to use this property to emulate the behavior of browsers that do not correctly support the CSS box model specification.
CSS CSS Property Experimental Reference

Class selectors

In an HTML document, CSS class selectors match an element based on the contents of the element's class attribute. The class attribute is defined as a space-separated list of items, and one of those items must match exactly the class name given in the selector.
Beginner CSS CSS Reference Selectors

Comments

Comments are used to add explanatory notes or prevent the browser from interpreting parts of the stylesheet.
beginner Beginner CSS CSS Reference

Mastering margin collapsing

Top and bottom margins of blocks are sometimes combined (collapsed) into a single margin whose size is the largest of the margins combined into it, a behavior known as margin collapsing.
CSS CSS Box Model Reference

CSS Charsets

CSS Charsets is a module of CSS that allow to define the character set used in the stylesheet.
CSS CSS Charsets Overview Reference

CSS Colors

CSS Colors is a module of CSS that deals with colors, color types and transparency.
CSS CSS Colors Overview Reference

CSS Fonts

CSS Fonts is a module of CSS that defines font-related properties and how font resources are loaded. It allows to define the style of a font, like its family, its size or its weight, and the variant of the glyph to be used, for a font that has several glyphs for one character. It also allows to define the height of a line.
CSS CSS Fonts Overview Reference

CSS Ruby

CSS Ruby is a module of CSS that provides the rendering model and formatting controls related to display ruby annotation, a form of interlinear annotation, short runs of text alongside the base text.
CSS CSS Ruby Overview Reference

Using CSS transforms

By modifying the coordinate space, CSS transforms change the shape and position of the affected content without disrupting the normal document flow. This guide provides an introduction to using transforms.
Advanced CSS CSS Transforms Guide