CSS Units
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 "Water" (CJK Water Ideograph, U+6c34) glyph found in the font used to render it. LH
Equal to the computed value of The  line-height
property of the element on which it's used, converted to an absolute length.
rem:represents the  font-size
of the root element ( Typically  ). When used within the root element  font-size
, it represents it 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  ), 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 and vw
vh
.
vmax:equal to the larger Of  vw
and  vh
.
/p>
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 pix Els. 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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