Jul 30, 2009 · The CSS that you referenced is very useful to a web-designer for debugging page layout problems. I often drop it into the page temporarily so I can see the size of all the page …

Mar 2, 2009 · What is the difference between # and . when declaring a set of styles for an element and what are the semantics that come into play when deciding which one to use?

May 28, 2012 · Searching for the ~ character isn't easy. I was looking over some CSS and found this .check:checked ~ .content { } What does it mean?

Jan 4, 2012 · In CSS there are some default styles applied to every web page in addition to your styles. These default styles define certain padding and margin values for elements like <h1>, …

May 9, 2010 · Learn about CSS selectors, including how to use "and" and "or" for efficient styling on Stack Overflow.

Dec 16, 2010 · 15 It is the CSS child selector. Example: div > p selects all paragraphs that are direct children of div. See this

Jul 15, 2009 · Update Jul 2023: Modern CSS now has @container queries support for size and soon also style & state, and that basically means a native way for an if/else condition. Below is …

Mar 17, 2025 · I'm using Tailwind CSS v4 in my Next.js project and getting the following errors in globals.css: Unknown at rule @plugin css (unknownAtRules) Unknown at rule @custom …

In the end I solved this by preloading the image, calculating the aspect ratio, comparing it versus the aspect ratio of the area and then apply the proper CSS style.

11 Using CSS pseudo-classes :is (previously :any and :matches) and :where, you can use comma to match multiple classes on any level. At the root level, :is(.abc, .xyz) and .abc, .xyz function …