24ways: articles: 1 row where where "published" is on date 2017-12-13

1 row where "published" is on date 2017-12-13

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Link	rowid ▼	title	contents	year	author	author_slug	published	url	topic
206	206	Getting Hardboiled with CSS Custom Properties	Custom Properties are a fabulous new feature of CSS and have widespread support in contemporary browsers. But how do we handle browsers without support for CSS Custom Properties? Do we wait until those browsers are lying dead in a ditch before we use them? Do we tool up and prop up our CSS using a post-processor? Or do we get tough? Do we get hardboiled? Previously only pre-processing tools like LESS and Sass enabled developers to use variables in their stylesheets, but now Custom Properties have brought variables natively to CSS. How do you write a custom property? It’s hardly a mystery. Simply add two dashes to the start of a style rule. Like this: --color-text-default : black; If you’re more the underscore type, try this: --color_text_default : black; Hyphens or underscores are allowed in property names, but don’t be a chump and try to use spaces. Custom property names are also case-sensitive, so --color-text-default and --Color_Text_Default are two distinct properties. To use a custom property in your style rules, var() tells a browser to retrieve the value of a property. In the next example, the browser retrieves the black colour from the color-text-default variable and applies it to the body element: body { color : var(--color-text-default); } Like variables in LESS or Sass, CSS Custom Properties mean you don’t have to be a dumb mug and repeat colour, font, or size values multiple times in your stylesheets. Unlike a preprocessor variable though, CSS Custom Properties use the cascade, can be modified by media queries and other state changes, and can also be manipulated by Javascript. (Serg Hospodarets wrote a fabulous primer on CSS Custom Properties where he dives deeper into the code and possible applications.) Browser support Now it’s about this time that people normally mention browser support. So what about support for CSS Custom Properties? Current versions of Chrome, Edge, Firefox, Opera, and Safari are all good. Internet Explorer 11 and before? Opera Mini? Nasty. Sound familiar? Can I Use css…	2017	Andy Clarke	andyclarke	2017-12-13T00:00:00+00:00	https://24ways.org/2017/getting-hardboiled-with-css-custom-properties/	code

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