UserAgent.me

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 Chrome

author
James Lee
• Friday, 11 December, 2020
• 13 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.crifan.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.

stylesheet
(Source: pilotaz.blogspot.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 want to modify the default values and add some new rules that would help me speed up my workflow and enhance my browsing experience. In Google Chrome, go to URL about:version and take note of the “profile path”.

Browse to the profile path in your file browser. Inside User StyleSheets”, there should be a file called Custom.css, empty by default.

For example, in the screenshot below the selected element receives line-height:24px from a rule defined in tools.css. For example, in the screenshot below the selected element inherits display:list-item from user agent stylesheet.

The labels on the image below correspond with the numbered items below it. Styles associated with a selector that matches the element.

user chrome sheet agent override css
(Source: stackoverflow.com)

User agent stylesheets are clearly labelled, and are often overridden by the CSS on your web page. Grey colored entries are rules that are not defined but instead computed at runtime.

Understanding how cascading and inheritance works is essential to debugging your styles. In the live page you can see all the elements that are affected by the selector.

Enable or disable the classes currently associated to the element. While a name or value is highlighted, press Tab to move forward to the next property, name, or selector.

Type it out, or paste the CSS into the Styles pane. Properties and their values are parsed and entered into the correct fields.

Note: To enable or disable a style declaration, check or uncheck the checkbox next to it. Click and hold the button to choose which stylesheet the rule is added to.

(Source: dev.to)

You need to hover over the style rule in order to see it. Click on one of these buttons to add the declaration to the style rule.

To the left of the declaration value there is a small, colored square. The color of the square matches the declaration value.

Click on the eyedropper button so that it is enabled (), hover over a color on the live page, and then click to set the currently selected declaration value to the color that you're hovering over. A set of colors automatically generated from the page's CSS.

A collection of colors consistent with the Material Design spec. DevTools saves your custom palette, even across pages, until you delete it.

To view a custom property defined in :root, inspect the HTML element. Currently, there is no way to jump to the custom property definition.

(Source: www.crifan.com)

If you are using Sass, Less, Stylus or any other CSS preprocessor, editing the generated CSS output files in the Styles editor won't help as they don't map to your original source. With CSS source maps, DevTools can automatically map the generated files to the original source files, which lets you live-edit these in the Sources panel and view the results without having to leave DevTools or refresh the page.

Open DevTools Settings and click General. Changes made in an external editor are not detected by DevTools until the Sources tab containing the associated source file regains focus.

Manual editing of a CSS file generated by the Sass/LESS/other compiler will break the source map association until the page is reloaded. Make sure the generated CSS file is also mapped into the workspace.

You can verify this by looking in Sources panel right-side tree, and seeing the CSS is served from your local folder. Otherwise, you must regenerate CSS files manually and reload the page to see your changes.

If you are not using the Workspaces feature, the web server must also supply the Last-Modified header. The Rendering Settings tab opens at the bottom of your DevTools window.

chromium table groups google stylesheet discuss agent chrome issue user re giovanni am
(Source: groups.google.com)

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If you have specific ideas on how to improve this page, please create an issue. If you have specific ideas on how to improve this page, please create an issue.

If you have specific ideas on how to improve this page, please create an issue. If you have specific ideas on how to improve this page, please create an issue.

If you have specific ideas on how to improve this page, please create an issue. If you have specific ideas on how to improve this page, please create an issue.

If you have specific ideas on how to improve this page, please create an issue. If you have specific ideas on how to improve this page, please create an issue.

chrome custom element css stylesheet agent shown user why dev javascript tools
(Source: stackoverflow.com)

After 30/40 min I looked up on browser extensions, and found out all these was happening due to AD Blocker. So if any above solution doesn't work for you, then try this as well once if you have this kind of browser extension.

The useragentstylesheet only kicks in if your CSS neglects to define a property for a tag. Chances are that, if you put the tag declaration at the beginning of the CSS file and it works, that you have an error in your CSS.

I had this persistent problem and discovered a mistake in my CSS. The char set should be set in the HTTP header, which is where it belongs.

To clarify, my question is about why the useragentstylesheet is overriding the CSS and how to make that stop. If I'm not mistaken, the correct behavior of CSS is that the cursor style should be inherited by child nodes.

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.

stylesheet agent user chrome property 1916 tab showing styles display dev changed thanks something tools version latest does
(Source: stackoverflow.com)

In specification, Cascading takes precedence over Inheritance. In order to use inherited value you should override using code as suggested by lb T. i.e..

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.

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. 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. Making statements based on opinion; back them up with references or personal experience.

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.

agent user stylesheet border matter overwrites chrome screenshot remove fireworks remains carved newsletter simple
(Source: stackoverflow.com)

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 instance, in the attached example (in the right, inside the red round rectangle), I can't seem to find the style for the

heading in the template.css file. I've edited a lot of styles before in template.css, but now I can't seem to advance.

Blacknail Topic Author Offline Junior Lime 6 years 6 months ago #107324 by blackmail Thanks for all the answers, I solved my problems by overriding the style in the template.css file (cache was preventing me from seeing the changes...).

Also changed

to

, Denis, I agree it can make more sense ;] CSS takes care of default formatting of documents through the concept of user agent style sheets, a cornerstone of the cascade.

Unlike Microsoft’s Internet Explorer as well as Opera, for example, Gecko browsers like Firefox and Netscape Navigator (“html.css”) but also Conqueror make it rather simple to comprehend their default styles. The following is a list of default style sheets I’ve compiled over recent years (except for Safari; thank you, Martin).

body stylesheet agent chrome user cross should text then would
(Source: stackoverflow.com)

Due to the fact that Fire bird, Firefox, and Co. are all based on the same layout engine, they’re quite similar, if not identical.

Sources
1 developers.whatismybrowser.com - https://developers.whatismybrowser.com/
2 github.com - https://github.com/3rd-Eden/useragent
3 deviceatlas.com - https://deviceatlas.com/blog/user-agent-parsing-how-it-works-and-how-it-can-be-used
4 udger.com - https://udger.com/resources/online-parser
5 faisalman.github.io - http://faisalman.github.io/ua-parser-js/
6 www.browscap.org - https://www.browscap.org/ua-lookup
7 github.com - https://github.com/nielsbasjes/yauaa
8 stackoverflow.com - https://stackoverflow.com/questions/1457380/is-there-an-online-user-agent-database