6 week work 1

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CSS单位

 

 

em and rem: are often used to create scalable layouts, which maintain the vertical rhythm of the page even when the user changes the font size.

cap:Represents the "cap height" (nominal height of capital letters) of the element’s font.

ch:Represents the width, or more precisely the advance measure, of the glyph "0" (zero, the Unicode character U+0030) in the element‘s font

em:Represents the calculated font-size of the element. If used on the font-size property itself, it represents the inherited font-size of the element.

ex:Represents the x-height of the element‘s font. On fonts with the "x" letter, this is generally the height of lowercase letters in the font; 1ex ≈ 0.5em in many fonts.

ic:Equal to the used advance measure of the "水" (CJK water ideograph, U+6C34) glyph found in the font used to render it.lhEqual to the computed value of the line-height property of the element on which it is used, converted to an absolute length.

rem:Represents the font-size of the root element (typically <html>). When used within the root element font-size, it represents its initial value (a common browser default is 16px, but user-defined preferences may modify this).

rlh:Equal to the computed value of the line-height property on the root element (typically <html>), converted to an absolute length. When used on the font-size or line-height properties of the root element, it refers to the properties‘ initial value.

vh:Equal to 1% of the height of the viewport‘s initial containing block.

vw:Equal to 1% of the width of the viewport‘s initial containing block.

vi:Equal to 1% of the size of the initial containing block, in the direction of the root element’s inline axis.

vb:Equal to 1% of the size of the initial containing block, in the direction of the root element’s block axis.

vmin:Equal to the smaller of vw and vh.

vmax:Equal to the larger of vw and vh.

px:One pixel. For screen displays, it traditionally represents one device pixel (dot). However, for printers and high-resolution screens, one CSS pixel implies multiple device pixels. 1px = 1/96th of 1in.

cm:One centimeter. 1cm = 96px/2.54.

mm:One millimeter. 1mm = 1/10th of 1cm.

Q:One quarter of a millimeter. 1Q = 1/40th of 1cm.

in:One inch. 1in = 2.54cm = 96px.

pc:One pica. 1pc = 12pt = 1/6th of 1in.

pt:One point. 1pt = 1/72nd of 1in.

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