CSS MDN — Volkswagen Pointer

4 Июн 2015 | Author: | Комментарии к записи CSS MDN — Volkswagen Pointer отключены
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The CSS data type distance measurements. It is a immediately by a length unit ( px. em. pc. in. mm. …). Like for any CSS there is no space between the literal and the number.

For some using negative lengths is a error, but for some properties, lengths are allowed. Please that although values are CSS dimensions and are accepted by some CSS that accept values, are not themselves, values.


of the CSS data type can be interpolated in to allow animations. In that they are interpolated as real, numbers. The interpolation happens on the value. The speed of the interpolation is by the timing function associated the animation.


Relative length

em This unit represents the font-size of the element. If used on the property itself, it represents the font-size of the element.

This is often used to create layouts, which keep the rhythm of the page. even the user changes the size of the The CSS properties line-height. font-size. and margin-top often has a value in em .

ex This unit represents the of the element’s font. On fonts the ‘x’ letter, this is the height of lowercase letters in the 1ex ≈ 0.5em in many fonts. ch unit represents the width, or precisely the advance measure, of the ‘0’ (zero, the Unicode U+0030) in the element’s font. rem unit represents the font-size of the element (e.g. the font-size of the (or HTML root element) the root of an HTML or XHTML All other elements must be of this element. element). used on the font-size on this element, it represents its initial

This unit is practical in perfectly scalable layout. If not by the targeted browsers, such can be achieved using the em unit, this is slightly more

Viewport-percentage lengths

Viewport-percentage defined a length relatively to the of viewport, that is the visible of the document. Only Gecko-based are updating the uw3e values when the size of the viewport is (by modifying the size of the window on a computer or by turning the device on a or a tablet).

In a @page at-rule declaration the use of the viewport lengths are invalid and the will be dropped.

vh 1/100th of the of the viewport. vw 1/100th of the width of the vmin 1/100th of the minimum between the height and the width of the vmax 1/100th of the maximum between the height and the width of the

Absolute length units

length units represents a measurement and when the physical of the output medium are known, as for print layout. This is by anchored one of the unit to a physical and to defined the other relatively to it. The is done differently for low-resolution like screens, and high-resolution like printers.

For low-dpi devices, the unit px the physical reference pixel and the are defined relative to it. Thus, 1in is as 96px which equals The consequence of this definition is on such devices, length in inches ( in ), centimeters ( cm ), millimeters ( mm ) necessary match the length of the unit with the same

For high-dpi devices, inches ( in ), ( cm ), millimeters ( mm ) are defined as their counterparts. Therefore the px unit is relative to them (1/96 of 1

Users may increase font for accessibility purpose. To allow for layouts whatever is the used size, use only absolute units when the physical of the output medium are known, as bitmap images. When length related to font-size, relative units like em or rem .

px to the viewing device.

For screen typically one device pixel of the display.

For printers and very resolution screens one CSS pixel multiple device pixels, so the number of pixel per inch around 96. mm One millimeter. cm One centimeter (10 in One inch (2.54 centimeters). pt One (which is 1/72 of an inch). pc One (which is 12 points). mozmm An unit which attempts to at exactly one millimeter regardless of the or resolution of the display. This is actually what you want, but may be in particular for mobile devices.

CSS units and dots-per-inch


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