2018年1月17日 · This is a common technique called a CSS reset. Different browsers use different default margins, causing sites to look different by margins. The * means "all elements" (a universal selector), so we are setting all elements to have zero margins, and zero padding, thus making them look the same in all browsers.

2010年7月12日 · > (greater-than sign) is a CSS Combinator(Combine + Selector). A combinator is something that explains the relationship between the selectors. A CSS selector can contain more than one simple selector. Between the simple selectors, we can include a combinator. There are four different combinators in CSS3: descendant selector (space) child ...

2021年5月28日 · It is a wildcard, this means it will select all elements within that portion of the DOM. For example, if I want apply margin to every element on my entire page you can use: * { margin: 10px; } You can also use this within sub-selections, for example the following would add a margin to all elements within a paragraph tag: p * { margin: 10px; }

Found this on Google, needs a little update as CSS nesting is now native, rather than just the preserve of SASS (and other CSS processors). You can find details about this here: W3C - CSS Nesting Module Working Draft, 14 February 2023, while some examples can be seen here: MDN - Using CSS nesting. Both Chrome and Firefox support CSS Nesting.

2009年3月2日 · The dot(.) signifies a class name while the hash (#) signifies an element with a specific id attribute. The class will apply to any element decorated with that particular class, while the # style will only apply to the element with that particular id.

Therefore, instead of adding the grid to its CSS, it adds -ms-grid. The vendor prefix kind of says "this is the Microsoft interpretation of an ongoing proposal." Thus, if the final definition of the grid is different, Microsoft can add a new CSS property grid without breaking pages that depend on …

2012年5月28日 · Searching for the ~ character isn't easy. I was looking over some CSS and found this .check:checked ~ .content { } What does it mean?

2023年4月21日 · Inline CSS coded into an HTML tag override ID, class, and tag CSS. Adding the !important value to a CSS style overrides everything else. If CSS selectors are identical, the browser combines their properties. If the resulting CSS properties conflict, the browser chooses the property value that appeared later or most recently in the code.

2018年10月23日 · height: 100vh; means the height of this element is equal to 100% of the viewport height. example: height: 50vh; If your screen height is 1000px, your element height will be equal to 500px (50% of 1000px). CALC height: calc(100% - 100px); will calculate the size of the element by using the value of the element. example:

These are all known in CSS as at-rules. They're special instructions for the browser, not directly related to styling of (X)HTML/XML elements in Web documents using rules and properties, although they do play important roles in controlling how styles are applied.