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      QUESTION INDEX      

Question Index
Browser Insanity
JavaScript
Animation
Buttons and Menus
CSS and HTML


  INFORMATIVE ARTICLES  

Menus-and-Buttons-
Part-I.htm

Menus-and-Buttons-
Part-II.htm

Change-Div-Size-Color-
and-Location-with-the-
W3C-DOM.htm

Bouncing-Ball-Animation-
with-the-W3C-DOM.htm

Style-Changes-with-the-
W3C-DOM.htm

Animation-with-the-
W3C-DOM.htm

Window-Play-and-Some-
Important-DOM-Methods.htm

Using-getElementsByTagName
-and-getElementsByName.htm

The-CSS-Resources-Intro-
Page.htm

Convert-Word-Files-to-HTML-
and-Install-Editor2-to-
Use-Instead-of-NotePad.htm

CSS-Issues.htm

Collapsing Margins

A margin is the space between the CSS box and any box nearby. It's invisible and it's the outermost property of the box. The default margin is usually 0. Collapsing margins are what vertical margins do in relation to other margins they bump up against. If box A has a surrounding margin property of 8 and its next-door neighbor box B has one of 4, then CSS displays them as, not 4 or 12 units apart, but 8 units. No adding is done, vertically. The rule is that the larger value is used, the smaller is unused.