[web] Possible to vertically centre a div tag inside another div tag?

middle    Align the vertical midpoint of the box with the baseline of the parent box plus half the x-height of the parent.sub    Lower the baseline of the box to the proper position for subscripts of the parent's box. (This value has no effect on the font size of the element's text.)super    Raise the baseline of the box to the proper position for superscripts of the parent's box. (This value has no effect on the font size of the element's text.)text-top    Align the top of the box with the top of the parent element's font.text-bottom    Align the bottom of the box with the bottom of the parent element's font.<percentage>    Raise (positive value) or lower (negative value) the box by this distance (a percentage of the 'line-height' value). The value '0%' means the same as 'baseline'.<length>    Raise (positive value) or lower (negative value) the box by this distance. The value '0cm' means the same as 'baseline'.

Quote:

5.4.4 'vertical-align' Value: baseline | sub | super | top | text-top | middle | bottom | text-bottom | Initial: baseline Applies to: inline elements Inherited: no Percentage values: refer to the 'line-height' of the element itself