It’s actually two part question regarding my simple page (that will be replaced some day with real content), HTML+CSS boilerplate used there for vertical centering and IE7.
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Can anyone provide detailed explanation why the page is displayed correctly in non-IE browsers (Chrome, Fx, Opera), almost all semi-recent to recent IEs (IE5.5, IE6, IE8, IE9), but not in IE7?
I am especially interested in: it works in IE6, yet it doesn’t work in IE7, because… kind of explanation.
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What should be changed to make
div#cproperly centered vertically in IE7?
I am using specific height fordiv#c, but used boilerplate is height-agnostic and fix should preserve this feature.Spoiling other browsers is not an option, unless it’s IE5.5 (ok, IE6 too, but only if it is really unavoidable).
Changing
<!DOCTYPE html>and turning IEs into quirks mode is also not accepted (and it’s a pretty bad practice for newly developed pages).
If you don’t have IE7 (just as I), you can visit http://ipinfo.info/netrenderer/ or http://browserling.com/, paste URL there and choose IE7 to see the problem yourself.
Because the page will change after accepting some answer, I’m providing snapshot of relevant HTML and CSS parts from it (with logo URL changed to be absolute).
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<style type="text/css">
html, body { height: 100%; }
body { background-color: #fff; color: #000; margin: 0px; padding: 0px; }
div { margin: 0px; padding: 0px; }
#outer { position: relative; width: 100%; height: 100%; overflow: visible; }
#outer[id] { display: table; position: static; }
#middle { position: absolute; top: 50%; width: 100%; text-align: center; } /* for explorer only*/
#middle[id] { display: table-cell; vertical-align: middle; position: static; }
#c { position: relative; top: -50%; } /* for explorer only */
#c { width: 385px; height: 120px; margin-left: auto; margin-right: auto; }
#c { background-image: url(http://engitize.net/engitize.png); background-repeat: no-repeat; background-position: center top; }
#c div { position: relative; top: 100px; width: 100%; color: #666; font-weight: bold; font-family: serif; font-size: 12px; text-align: right; }
#footer { width: 100%; text-align: center; height: 15px; padding: 5px 0 0 0; margin: -20px auto 0 auto; border: 0; background-color: #def; }
#footer div { padding: 0px 5px 0px 5px; text-align: right; font-size: 10px; font-family: sans-serif; }
a { text-decoration: none; color: #006; }
a:hover { color: #00c; }
p { margin: 0px; padding: 0px; }
</style>
</head>
<body>
<div id="outer"><div id="middle"><div id="c"><div>
because history is important!
</div></div></div></div>
<div id="footer"><div>
<p style="float:left;"><strong>Przemysław Pawełczyk</strong>'s imprint | Coming in 2012!</p>
<p style="float:right;"><a href="http://przemoc.net/">Przemoc's network</a></p>
</div></div>
</body>
</html>
your Q#1 has been answered by @thirtydot, IE7 and below does not support the CSS table properties so another way has to be found for them. and his absolute positioning technique is usually the preferred way to do this as most times in a scenario like this (splash page?) the width and height of the centred content would be known.
addendum to above per comments:
In answer to why it was working in IE6 and not IE7 even though IE6 doesn’t support the table properties either, IE7 was actually picking up the
position: staticrule from the#middle[id] {}rule – IE7 does understand this type of selector so this means the later absolute/relative positioning was not working the same as it was in IE6Taking the above into account redoing the CSS to make sure IE7 and 6 got the same CSS and that it was placed later in cascade to override the “good” CSS it turns out the the positioning method is height agnostic too, in the comments there are various links to to test this, but here is the final working version:
Hybrid table cell/positioning method : here
That fiddle does include the image width and heights, but if you remove them and the positioning for the “sub text” it does (or should) show that whatever is in the middle does stay centered
HTML used is the same as the bottom of this answer.. minus the extra
<i></i>elementCSS:
As pointed out in comments using the technique that the HTML5 boilerplate uses to class the HTML element conditionally see:
means you could replace the IE7 hacks with:
Original alternative – “Matchstick Technique”
You could likely mix the following technique with the “table-cell” technique via conditional comments or hacks, but this (hacky!) technique works across browser as far as my tests have seen
As you’ve asked for a height agnostic version.. you might or might not like the “matchstick” technique, this involves using inline blocks and lining them up.. the “matchstick” is a 100% high empty, off page, inline-block element with its vertical-alignment set to “middle” once it’s in place the next inline-block (your actual content div) sits beside it and aligns to the middle or it, then using
text-align: center;on it you have the horizontal centering toohere’s a link to a working example fiddle
Note: I’ve left your widths intact, but you can test without widths/heights by removing the height & width off
#cand also remove the CSS for the#c divtext div – in a plain text scenario entering text into either of these divs should ‘auto’ centre.and especially note the insertion of the extra
<i></i>HTML just inside the outer div (that’s likely why this is not a preferred method!), this is the “matchstick” that props the whole page open.Code used in fiddle:
HTML: