User Agent Style Sheets : Mystery Margins in Google Chrome
Yesterday, like every other “Ground Hog Day” , I was working on some CSS/tableless layouts. All was going well in IE 7, FF 3 and Chrome, untill suddenly, I saw some un-ignorable margins seen only in Google Chrome. Though very strange and worring, It was some new bug/issue that I had come accross, there was finally some spice in my mundane work . Sad (but nice) it got fixed within a few minutes of the probe…
Basically , It looked like Google Chrome ignored my CSS Resets ( margin:0px). It actually was caused by the user agent stylesheet (-webkit-padding-start:40px). So the solution was to reset this style by setting padding:0 the misbehaving elements .
A good way to prevent this problem from happening to any element is use a global CSS Rest as follows
*{ margin:0; padding:0; }
What is User Agent Style Sheets (Specification) ?
The following excerpt is taken from http://meiert.com/en/blog/20070922/user-agent-style-sheets/ , follow link to read more on User Agent Style Sheets
CSS 1 introduces the idea by stating that each User Agent (UA, often a ‘web browser’ or ‘web client’) will have a default style sheet that presents documents in a reasonable – but arguably mundane – manner. CSS 2 says that conforming user agents must apply a default style sheet (or behave as if they did) and that a user agent’s default style sheet should present the elements of the document language in ways that satisfy general presentation expectations for the document language; CSS 3 is likely to be of the same mind.
Since the CSS specifications leave it up to implementations whether to use a “real” style sheet for default display or not, it’s not astonishing that you don’t find a default style sheet in every browser’s installation folder. Unlike Microsoft’s Internet Explorer as well as Opera, for example (and as far as I know), Gecko browsers like Firefox and Netscape Navigator (look for “html.css”) but also Konqueror make it rather simple to comprehend their default styling.
Subscribe to by Email









































July 28th, 2009 at 10:42 am
[...] Expressing IT Just another, but serious developers weblog « User Agent Style Sheets : Mystery Margins in Google Chrome [...]
February 3rd, 2010 at 10:14 pm
I just ran into the same issue… your solution is simple and now it looks like it should : ) In general it might be a great idea to have some defaults… but it is not an expected behavior. Still, chrome is the most reliable browser I know of…