Is There a List of Browser Conditionals for Use Including Stylesheets

Is there a list of browser conditionals for use including stylesheets?

This works across all browsers because anything except IE sees . Only IE reads the comment if it contains a conditional clause. Have a look at this article

You can also specify which version of IE. For example:

<!--[if IE 8]>
<link rel="stylesheet type="text/css" href="ie8.css" />
<![endif]-->

Is there a way to do browser specific conditional CSS inside a *.css file?

There is a way to do it in IE by taking advantage of bugs in the browser and @import. The best method I've seen is here, courtesy of bobince (and definitely beat out my answer, heh).

In general though, no. Even conditional comments are browser-specific to IE.

Can you use if/else conditions in CSS?

Not in the traditional sense, but you can use classes for this, if you have access to the HTML. Consider this:

<p class="normal">Text</p>

<p class="active">Text</p>

and in your CSS file:

p.normal {
  background-position : 150px 8px;
}
p.active {
  background-position : 4px 8px;
}

That's the CSS way to do it.

Then there are CSS preprocessors like Sass. You can use conditionals there, which'd look like this:

$type: monster;
p {
  @if $type == ocean {
    color: blue;
  } @else if $type == matador {
    color: red;
  } @else if $type == monster {
    color: green;
  } @else {
    color: black;
  }
}

Disadvantages are, that you're bound to pre-process your stylesheets, and that the condition is evaluated at compile time, not run time.

A newer feature of CSS proper are custom properties (a.k.a. CSS variables). They are evaluated at run time (in browsers supporting them).

With them you could do something along the line:

:root {
  --main-bg-color: brown;
}

.one {
  background-color: var(--main-bg-color);
}

.two {
  background-color: black;
}

Finally, you can preprocess your stylesheet with your favourite server-side language. If you're using PHP, serve a style.css.php file, that looks something like this:

p {
  background-position: <?php echo (@$_GET['foo'] == 'bar')? "150" : "4"; ?>px 8px;
}

In this case, you will however have a performance impact, since caching such a stylesheet will be difficult.

load different css file based on browser

Request.Browser will give you complete browser information, where you can check version, browser name, browser type etc.

if(Request.Browser.Browser == "IE")
    {
        HtmlLink css = new HtmlLink();
        css.Href = ResolveClientUrl("~/style/StyleSheet.css");
        css.Attributes["rel"] = "stylesheet";
        css.Attributes["type"] = "text/css";
        css.Attributes["media"] = "all";
        Page.Header.Controls.Add(css);
    }

Different CSS files for Different Browsers

I know only for ie:

<!--[if IE]><link href="/ie.css" rel="stylesheet" type="text/css" /><![endif]-->

also js detection

Is there a way to set any style for a specific browser in CSS?

For example, if I want to set the corner radius in Webkit, Firefox and other than I can use the following CSS

No, that isn't how it works.

Vendor prefixed properties are used for experimental features. Either because the specification for the property hasn't been locked down or because the browser implementor knows their are problems with the implementation.

In general, you shouldn't use them in production code because they are experimental.

Support for the vendor prefixed versions is removed as support stabilises.

Is there a way to set any style for a specific browser in CSS?

There are several methods that have been used for that effect.

Parser bugs

By exploiting bugs or unsupported features in specific CSS engines (e.g. some versions of IE will ignore a * character on the front of a property name while other browsers will (correctly) discard the entire rule).

Conditional comments

Older versions of Internet Explorer supported an extended HTML comment syntax that could be used to add <link> or <style> elements specifically for certain versions of IE.

Support for this has been dropped.

JavaScript

Classes can be added to elements (typically the body element) using JavaScript after doing browser detection in JS.

How to use a different CSS stylesheet if a user has JavaScript disabled in their browser?

Two ways to do it:

Append the JavaScript-only stylesheets with JavaScript:

function appendStyle(url) {
  var sheet = document.createElement("link");
  sheet.setAttribute("href", url);
  sheet.setAttribute("rel", "stylesheet");
  sheet.setAttribute("type", "text/css");
  document.head.appendChild(sheet);
}

If you don't mind loading the CSS for the JS and you just want to override your site's default appearance you can use a noscript tag instead:
```
<noscript>
  <link href="your/no-js/stylesheet.here.css" type="text/css" rel="stylesheet">
</noscript>
```

What is the best technique for consistent form, function between all web browsers (including Google Chrome)?

I am in a similar situation, working on a web app that is targeted at IT professionals, and required to support the same set of browsers, minus Opera.

Some general things I've learned so far:

Test often, in as many of your target browsers as you can. Make sure you have time for this in your development schedule.
Toolkits can get you part of the way to cross-browser support, but will eventually miss something on some browser. Plan some time for debugging and researching fixes for specific browsers.
If you need something that's not in a toolkit and can't find a free code snippet, invest some time to write utility functions that encapsulate the browser-dependent behavior.
Educate yourself about known browser bugs, so that you can steer your implementation around them.

A few more-specific things I've learned:

Use conditional code based on the user-agent only as a last resort, because different generations of the "same" browser may have different features. Instead, test for standards-compliant behavior first — e.g., if(node.addEventListener)..., then common non-standard functions — e.g., if(window.attachEvent)..., and then, if you must, look at the user-agent for a specific browser type & version number.
Knowing when the DOM is 'ready' for script access is different in just about every browser. A good toolkit will abstract this for you.
Event handlers are different in just about every browser. A good toolkit will abstract this for you.
Creating DOM elements, particularly form controls or elements with attributes, can be tricky with document.createElement and element.setAttribute. While not standard (and kinda yucky), using node.innerHTML with strings that contain bits of HTML seems to be more reliable across browser types. I have yet to find a toolkit that will let you use element.setAttribute to add a 'name' to a form element in IE.
CSS differences (and bugs) are just as important as JS differences.
The 'core' Javascript features (String, Date, RegExp, Array functions) seem to be pretty reliable and consistent across browsers, especially relative to the DOM/CSS/Window functions. There's some small joy in the fact that the language isn't entirely different on every platform. :-)

I haven't really run into any Chrome-specific JS bugs, but it's always one of the first browsers I test.

HTH

Is there a way to check which CSS styles are being used or not used on a web page?

Install the CSS Usage add-on for Firebug and run it on that page. It will tell you which styles are being used and not used by that page.

Is There a List of Browser Conditionals for Use Including Stylesheets