[OpenLayers-Dev] Examples behave different in IE due to Quirks Mode

Christopher Schmidt crschmidt at metacarta.com
Wed Jun 11 07:08:53 EDT 2008

On Wed, Jun 11, 2008 at 11:05:01AM +0200, Andreas Hocevar wrote:
> Hi,
> I just encountered a strange viewing experience of many of the  
> examples. Try e.g. http://www.openlayers.org/dev/examples/example.html 
> in IE and compare with other browsers: IE zooms to zoom level 0, other 
> browsers to zoom level 0.
> After some investigation, i saw that the map viewport is 510x254px in 
> IE, and 512x256px in other browsers. Now if you add a DOCTYPE to the 
> html that forces the browser into standards compliant mode (e.g. 
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">), the viewport size 
> will be 512x256px in all browsers.
> So the reason why this causes different zoom levels is that the default 
> for Map.maxResolution is 1.40625, which fits 360 deg into 256 px. If we 
> have less px, a map of the world won't fit.
> Should we change the examples to use standards compliant mode?

In general, I haven't tested OpenLayers in anything other than quirks
mode, so I'm not sure that all things -- like vector rendering and the
like -- work correctly. If they do, then I'm fine with that.

Christopher Schmidt

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