CSS GUIDE VERTICAL ALIGN
This document is a work in progress and is subject to change.
Summary
The vertical-align property affects the vertical inside a line box of the boxes generated by an inline-level element. The following values only affect a parent inline-level element, or to a parent block-level element. If that element generates anonymous inline boxes (refer to this), they have no effect if no such parent exists.
Vertical-align attribute only considers the alignment within the current line, not within the containing box.
| Applicability: | The vertical-align property can be used for all CSS elements. |
| Media Group: | Visual |
| Inherited: | No |
Syntax
Vertical aligning element
- Mozilla cannot do vertical-align for a <div> element.
- The only way to get mozilla to put something in the middle of a containing box vertically is to use a table cell or set the padding top and bottom to be equal or to make the line-height equal to the height of the containing box and then use vertical-align: middle (this last way required the content to be only a single line).
- The reason for this is that the vertical-align attribute only considers the alignment within the current line, not within the containing box.
Vertical aligning images
- Mozilla aligns images differently then old browsers, in order to be in compliance with the W3C specifications. When placing an image inside of a box, padding appears below the image. The gap you're seeing is space that's reserved for the descenders in text.
- Mozilla places images on the baseline, so the descender space is visible as a few-pixel gap underneath the image.
- Mozilla recommends that you use this CSS rule:
img { vertical-align: text-bottom; }
General usage
See usage examples section for more details.
Legal Values
The following units are valid for defining vertical-align:
- baseline
- sub
- super
- top
- text-top
- middle
- bottom
- text-bottom
- length
- %
See usage examples section for more details.
Mozilla Recommended Values
Usage Examples
baseline
img{vertical-align:baseline;}/*The element is placed on the baseline of the parent element*/
sub
img{vertical-align:sub}/*Aligns the element as it was subscript*/
super
img{vertical-align:super}/*Aligns the element as it was superscript*/
top
/*The top of the element is aligned with the top of the tallest element on the line*/
img{vertical-align:top}
text-top
/*The top of the element is aligned with the top of the parent element's font*/
img{vertical-align:text-top}
middle
img{vertical-align:middle}/*The element is placed in the middle of the parent element*/
bottom
/*The bottom of the element is aligned with the lowest element on the line*/
img{vertical-align:bottom}
text-bottom
/*The bottom of the element is aligned with the bottom of the parent element's font*/
img{vertical-align:text-bottom}
length
img { vertical-align: -5px; }
img { vertical-align: 10mm; }
%
/*Aligns the element in a % value of the "line-height" property. Negative values are allowed*/
img{vertical-align: 125%;}
img { vertical-align: -50%; }
Notes
The World Wide Web Consortium (W3C) provides a free online CSS validation service.
Specification Conformance
Browser Compatibility
- Internet Explorer
- Firefox
- Opera