When it comes to front-end design in CSS, the use of pixels as a measurement is quite common. However, with varying display sizes and resolutions, one might wonder how relevant this fixed pixel size really is. Is there a way to utilize real-world measurements like millimeters for more accuracy, or does it truly make sense to stick with pixels despite the wide range of screen resolutions found in different devices?
Relative font lengths: the ‘em’, ‘ex’, ‘ch’, ‘rem’ units
Viewport percentage lengths: the ‘vw’, ‘vh’, ‘vmin’, ‘vmax’ units
Static lengths: the ‘cm’, ‘mm’, ‘in’, ‘pt’, ‘pc’, ‘px’ units
It's important to note that not all of these length units are universally supported by all browsers. For more details, visit http://caniuse.com/viewport-units
Source: http://www.w3.org/TR/css3-values/
Absolute lengths like px are commonly used in responsive design media queries, in conjunction with a viewport meta tag such as
<meta name="viewport" content="width=device-width">While viewport percentage based lengths may offer the best scalability, their support is not consistent across all browsers, making them potentially less reliable for universal use.
When it comes to specifying measurements in CSS, there are a variety of units you can use. To explore the different options available, check out the W3C CSS units.
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