What is a user agent stylesheet

Question

I m working on a web page in Google Chrome  It displays correctly with the following styles   table       display  table      border-collapse  separate      border-spacing  2px      border-color  gray      It is important to note that I didn t define these styles  In Chrome developer tools  it says user agent stylesheet in place of the CSS file name   Now if I submit a form and some validation error occurs  I get the following stylesheet   table       white-space  normal      line-height  normal      font-weight  normal      font-size  medium      font-variant  normal      font-style  normal      color  -webkit-text      text-align  -webkit-auto     table       display  table      border-collapse  separate      border-spacing  2px      border-color  gray      The font-size from these new styles is disturbing my design  Is there a way to force my stylesheets and if possible  completely overwrite Chrome s default stylesheet

User · Accepted Answer

What are the target browsers  Different browsers set different default CSS rules  Try including a CSS reset  such as the meyerweb CSS reset or normalize css  to remove those defaults  Google  CSS reset vs normalize  to see the differences

User · Answer

I just wanted to expand on the response from  BenM based on what I read here from Ire Aderinokun  Because the user-agent stylesheet provides helpful default styling  think twice before overriding it   I had a dumb error where a button element didn t look right in Chrome  I had partially styled it because I didn t want it to look like a traditional button  However  I left out style elements like border  border-color  etc  So Chrome was stepping in to supply the parts that it thought I was missing    The problem went away once I added styles like border  none  etc   So if anyone else is having this problem  make sure you are explicitly overriding all the applicable default user-agent styles for an element if you notice it looks wonky  especially if you don t want to reset the user agent styles completely  It worked for me

User · Answer

Marking the document as HTML5 by the proper doctype on the first line  solved my issue    lt  DOCTYPE html gt   lt html gt

User · Answer

I have a solution  Check this   Error   lt link href  assets css bootstrap min css  rel  text css  type  stylesheet  gt    Correct    lt link href  assets css bootstrap min css  rel  stylesheet  type  text css  gt

User · Answer

Regarding the concept    user agent style sheet     consult section Cascade in the CSS 2 1 spec   User agent style sheets are overridden by anything that you set in your own style sheet  They are just the rock bottom  in the absence of any style sheets provided by the page or by the user  the browser still has to render the content somehow  and the user agent style sheet just describes this   So if you think you have a problem with a user agent style sheet  then you really have a problem with your markup  or your style sheet  or both  about which you wrote nothing

User · Answer

I had the same problem as one of my  lt div  s had the margin set by the browser  It was quite annoying but then I figured out as most of the people said  it s a markup error   I went back and checked my  lt head  section and my CSS link was like below    lt link rel  stylesheet  href  ex css  gt   I included type in it and made it like below    lt link rel  stylesheet  type  text css  href  ex css  gt   My problem was solved

User · Answer

Some browsers use their own way to read  css files  So the right way to beat this  If you type the command line directly in the  html source code  this beats the  css file  in that way  you told the browser directly what to do and the browser is at position not to read the commands from the  css file  Remember that the commands writen in the  html file is stronger than the command in the  css

User · Answer

Each browser provides a default stylesheet  called the user agent stylesheet  in case an HTML file does not specify one  Styles that you specify override the defaults   Because you have not specified values for the table element   s box  the default styles have been applied

User · Answer

I ran into this same issue  it was because I was working with non-semantic html  lt  --incorrect-- gt   lt ul class  quot my-custom-font quot  gt     lt button gt       lt a gt user agent styles applied instead of my-custom-font lt  a gt     lt button gt   lt  ul gt    lt  --correct-- gt   lt ul class  quot my-custom-font quot  gt     lt li gt       lt a gt now inherits from from my-custom-font lt  a gt     lt  li gt   lt  ul gt   Once the HTML was updated  styles were applied correctly

User · Answer

Define the values that you don t want to be used from Chrome s user agent style in your own CSS content

User · Answer

Answering the question in title  what is the user agent stylesheet  the set of default styles in the browser  Here are some of them  and most relevant ones also in today s web    Gecko  Firefox   https   searchfox org mozilla-central source layout style res html css  Chromium  Chrome   https   chromium googlesource com chromium src third party   master blink renderer core html resources html css  WebKit  Safari   https   trac webkit org browser trunk Source WebCore css html css   Personal opinion  Don t fight with them  They have good default values  for example  in rtl bidi cases and are consistent nowadays  Reset what you see irrelevant to you  not all of them at once

User · Answer

If  lt  DOCTYPE gt  is missing in your HTML content you may experience that the browser gives preference to the  user agent stylesheet  over your custom stylesheet  Adding the doctype fixes this

User · Answer

Put the following code in your CSS file   table       font-size  inherit

User · Answer

A user agent style sheet is a    default style sheet    provided by the browser  e g   Chrome  Firefox  Edge  etc   in order to present the page in a way that satisfies    general presentation expectations     For example  a default style sheet would provide base styles for things like font size  borders  and spacing between elements  It is common to employ a reset style sheet to deal with inconsistencies amongst browsers   From the specification        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    The Cascade    For more information about user agents in general  see user agent

[css] What is a user agent stylesheet?

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