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What Does Your User Agent Say About You?

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A user agent is a computer program representing a person, for example, a browser in a Web context.

Besides a browser, a user agent could be a bot scraping webpages, a download manager, or another app accessing the Web. Along with each request they make to the server, browsers include a self-identifying User-Agent HTTP header called a user agent (UA) string. This string often identifies the browser, its version number, and its host operating system.

Spam bots, download managers, and some browsers often send a fake UA string to announce themselves as a different client. This is known as user agent spoofing.

The user agent string can be accessed with JavaScript on the client side using the navigator.userAgent property.

A typical user agent string looks like this: "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:35.0) Gecko/20100101 Firefox/35.0".

(Source: Mozilla.org)

User Agent String

Browser Data

User Agent Stylesheet Div

author
Maria Johnson
• Wednesday, 11 November, 2020
• 8 min read

Peter Mortensen 27.2k2121 gold badges9393 silver badges123123 bronze badges If is missing in your HTML content you may experience that the browser gives preference to the useragentstylesheet over your custom stylesheet.

(Source: www.dtcnnet.com)

Contents

Peter Mortensen 27.2k2121 gold badges9393 silver badges123123 bronze badges Regarding the concept user agent style sheet”, consult section Cascade in the CSS 2.1 spec.

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. Marking the document as HTML5 by the proper doc type on the first line, solved my issue.

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.

Peter Mortensen 27.2k2121 gold badges9393 silver badges123123 bronze badges Each browser provides a default stylesheet, called the useragentstylesheet, in case an HTML file does not specify one.

I had a dumb error where a button element didn't look right in Chrome. So Chrome was stepping in to supply the parts that it thought I was missing.

(Source: qna.habr.com)

Peter Mortensen 27.2k2121 gold badges9393 silver badges123123 bronze badges In Chrome developer tools, it says useragentstylesheet in place of the CSS file name.

I believe what is happening is that your mobile breakpoint {your grid stylesheet} is telling all “grid-” elements to become 100% width. Since your IMG are within a grid-1 class it makes the div elements full width of the browser on smaller screens.

I'm developing a website and trying to debug in Chrome dev tool. On Chrome dev tool it says Sergeant style instead of CSS file.

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 among browsers.

For this create CSS class and override the agent style sheet. I downloaded the latest boilerplate a few days ago and designed on it.

(Source: teratail.com)

5 minutes ago, Chrome (WebKit) all of a sudden decided to insert extra CSS rules in my design: Any CSS rule that applies to an element will override the values from an useragentstylesheet.

I'm working on a web app that has a poplar similar to Facebook's blue bar at the top. The UL has a 1em margin as defined by the useragentstylesheet of my browser.

The issue is that the OP did not pick a rule that could possibly override the margin property that is set by the Sergeant (UA) directly on the UL tag. Inheritance is the means by which, in the absence of any specific declarations from any source applied by the CSS cascade, a property value of an element is obtained from its parent element.

This is a better attempt, a more specific selector #Vienna, which matches the Vienna element lower in the DOM, but the same principle applies, because the UL element is still below this element in the DOM. So, assuming that the UA rule used the selector UL and not !important, which is most likely the case, the solution would have been a simple UL {margin: 0;} , but it would be safer to make it more specific, say #Vienna UL {margin: 0} .

Sevenseacat sevenseacat23k55 gold badges5858 silver badges8383 bronze badges To clarify, my question is about why the useragentstylesheet is overriding the CSS and how to make that stop.

(Source: www.codegrepper.com)

Becerra Beterraba6,31011 gold badge2323 silver badges3333 bronze badges This allows the behavior I originally expected to happen in all cases where the user agent would otherwise cause the style not to inherit.

Answering this question generally with elaborating the explanation I would say, the final value of CSS property is a four-step calculation (i.e. In specification, Cascading takes precedence over Inheritance.

The conflicting declarations will be applied in the following order; later ones will override earlier ones: In above code since you only have user agent style sheet bounded with the element directly, hence takes precedence.

In short inheritance < cascading < importance < useragentstylesheet is precedence order in your case. This behavior is seen in Chrome only (it is not in Firefox, I didn't test Edge or others).

Chrome applies a pale yellow background (#E8F0FE) Today I got the same issue, tested with no such pale-effect on Safari and Brave... Not sure why the so-long-waiting (3 years and counting) from Chrome to come up with a fix.

stylesheet agent override reset trying answer alex
(Source: stackoverflow.com)

I thought I had this problem and checked the usual suspects, Doc type, etc. As ridiculous as this sounds, it turned out the style which I thought was being applied was commented out in the CSS.

If you want to see first hand how browsers display HTML, create a simple .html document with different header, paragraph and image elements and open it with different browsers. Maybe a plain HTML file will make the browse reveal it's CSS URI.

Thus, it resets the property to its inherited value if it inherits from its parent or to the default value established by the useragent's stylesheet (or by user styles, if any exist). If used within the user agent's default styles, this keyword is functionally equivalent to unset.

The revert keyword works exactly the same as unset in many cases. The only difference is for properties that have values set by the browser or by custom stylesheets created by users (set on the browser side).

So in the below example, we set custom font-weight in a global stylesheet, but then try to unset and revert. Unset will keep the text normal because this is an initial value for font-weight property.

(Source: magnet88jp.hateblo.jp)

Also note that both the header and plain text node is black. Use inherit to make an element's property the same as its parent.

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Sources
1 stackoverflow.com - https://stackoverflow.com/questions/9450066/getting-the-user-agent-with-javascript
2 docs.microsoft.com - https://docs.microsoft.com/en-us/microsoft-edge/web-platform/user-agent-string
3 developer.mozilla.org - https://developer.mozilla.org/en-US/docs/Web/API/NavigatorID/userAgent
4 developer.mozilla.org - https://developer.mozilla.org/en-US/docs/Web/HTTP/Browser_detection_using_the_user_agent
5 code-boxx.com - https://code-boxx.com/detect-browser-with-javascript/
6 davidwalsh.name - https://davidwalsh.name/user-agent-parser
7 www.geeksforgeeks.org - https://www.geeksforgeeks.org/how-to-detect-the-user-browser-safari-chrome-ie-firefox-and-opera-using-javascript/
8 security.stackexchange.com - https://security.stackexchange.com/questions/131482/triggering-javascript-by-user-agent-string-csrf-or-xss
9 www.surfingsuccess.com - http://www.surfingsuccess.com/javascript/javascript-browser-detection.html