How to Style Svg With External Css

How to style SVG with external CSS?

Your main.css file would only have an effect on the content of the SVG if the SVG file is included inline in the HTML:

https://developer.mozilla.org/en/docs/SVG_In_HTML_Introduction

<html>
  <body>
  <svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 56.69 56.69">
    <g>
      <path d="M28.44......."/>
    </g>
  </svg>
</html>

If you want to keep your SVG in files, the CSS needs to be defined inside of the SVG file.

You can do it with a style tag:

http://www.w3.org/TR/SVG/styling.html#StyleElementExample

<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" 
  "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
     width="50px" height="50px" viewBox="0 0 50 50">
  <defs>
    <style type="text/css"><![CDATA[
      .socIcon g {
        fill:red;
      }
    ]]></style>
  </defs>
  <g>
    <path d="M28.44......./>
  </g>
</svg>

You could use a tool on the server side to update the style tag depending on the active style. In ruby you could achieve this with Nokogiri. SVG is just XML. So there are probably many XML libraries available that can probably achieve this.

If you're not able to do that, you will have to just have to use them as though they were PNGs; creating a set for each style, and saving their styles inline.

How do you style a external svg with css

If you include your svg image by referencing an external file, like you do with the object tag, the elements in the svg image are not included to your main documents DOM tree. They comprise their own tree. Therefore, the elements in the external image can't be matched by CSS selectors in the main document.

You can style the object element like you could most other elements, for example giving it a border. But you can't (this way, at least) access the elements in the external image. In your case, you try to style #ob's color. That would apply to the objects text color, not to any color inside the referenced svg image. On browsers not supporting svg, the "Your browser does not support SVG" notice would probably rendered in blue.

The case with your CSS selector for svg is similar: CSS selectors in the main document match only to elements in the main document, and there's no svg to be found, just an object.

There are some ways to apply CSS styling to svg elements. The idea generally is to bring the CSS and the svg elements to the same DOM tree, either by getting the svg elements from the external file to the main document or the CSS from the main document to the external file:

Embed your svg element and its child elements directly into the main document instead of referencing an external file. In this case, the svg element and its children will be part of the man document's DOM tree, so they're accessible to the main document's CSS.
Embed an svg element into your main document and use xlink's use to reference an external svg image (rather, a part of it). For the general idea, see this answer or this answer.
Load the elements from the external image to the main documents tree via AJAX/XHR. For the general idea, again see this answer.
You can grab a hold of the external images' tree with JavaScript and edit their styles from there. The keyword for that would be contentDocument, see this answer.
If you can't get the elements from your external svg image to your main document's DOM tree, so the main documents CSS selectors can match to it, you can try the other way around: Add your CSS to your svg file. Similar to the ways you can include CSS into a html document, you can use inline style attributes, use a style element like in html's head or reference an external CSS file with <?xml-stylesheet ... ?>. For more information, see for example this tutorial.

How to apply a style to an embedded SVG?

Short answer: no, since styles don't apply across document boundaries.

However, since you have an <object> tag you can insert the stylesheet into the svg document using script.

Something like this, and note that this code assumes that the <object> has loaded fully:

var svgDoc = yourObjectElement.contentDocument;
var styleElement = svgDoc.createElementNS("http://www.w3.org/2000/svg", "style");
styleElement.textContent = "svg { fill: #fff }"; // add whatever you need here
svgDoc.getElementById("where-to-insert").appendChild(styleElement);

It's also possible to insert a <link> element to reference an external stylesheet:

var svgDoc = yourObjectElement.contentDocument;
var linkElm = svgDoc.createElementNS("http://www.w3.org/1999/xhtml", "link");
linkElm.setAttribute("href", "my-style.css");
linkElm.setAttribute("type", "text/css");
linkElm.setAttribute("rel", "stylesheet");
svgDoc.getElementById("where-to-insert").appendChild(linkElm);

Yet another option is to use the first method, to insert a style element, and then add an @import rule, e.g styleElement.textContent = "@import url(my-style.css)".

Of course you can directly link to the stylesheet from the svg file too, without doing any scripting. Either of the following should work:

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet href="my-style.css" type="text/css"?>
<svg xmlns="http://www.w3.org/2000/svg">
  ... rest of document here ...
</svg>

or:

<svg xmlns="http://www.w3.org/2000/svg">
  <defs>
    <link href="my-style.css" type="text/css" rel="stylesheet" 
          xmlns="http://www.w3.org/1999/xhtml"/>
  </defs>
  ... rest of document here ...
</svg>

Update 2015: you can use jquery-svg plugin for apply js scripts and css styles to an embedded SVG.

How to set a External SVG color in HTML using CSS?

The problem is that you don't target the actual SVG element, you target the "SVG container". To be able to change the color of one of the elements inside the SVG you have to target that specific element.

E.g change the fill color of all paths in a SVG:

.weather_icon path {
    fill: yellow;
}

If you want to make it easier to handle add class names to the different elements inside the svg.

<path class="my-class" ......... />

This will make it possible to target a specific element by its class:

.weather_icon .my-class {
    fill:blue;
    stroke:green;
}

How to draw SVG with external CSS on HTML5 Canvas

One solution would be reading the CSS file content and insert it as a style node into your SVG:

// Create style element and insert the rules in it
let style = document.createElementNS("http://www.w3.org/2000/svg", "style");
style.textContent = getCssStringFromFile('common.css');
svgElement.insertBefore(style, svgElement.firstChild);

Here is getCssStringFromFile function:

/**
 * Returns css rules as string from linked css file 
 * @param {string} fileName - The css file name.
 */
function getCssStringFromFile(fileName){
  let cssStyles = "";

  for(let i=0; i < document.styleSheets.length; i++) {
        let styleSheet = document.styleSheets[i];

        if (!styleSheet.href || styleSheet.href.indexOf(fileName) == -1)
           continue;

        let style = null;

        if (styleSheet) {
           if (typeof styleSheet.cssRules !== "undefined")
              style = styleSheet.cssRules;
           else if (typeof styleSheet.rules !== "undefined")
              style = styleSheet.rules;
        }
        for(let item in style) {
           if(typeof style[item].cssText !== "undefined")
              cssStyles += (style[item].cssText);
        }

        break;
  }

  return cssStyles;
}

Please see the demo here

Is it possible to use both an external css stylesheet / js file and an external svg file?

If the SVG has the same host as a document you can use getSVGDocument to get SVG document from JavaScript

    <object id="map" data="js.svg" type="image/svg+xml"></object>
    <script>
      const mapObject = document.getElementById("map");
      mapObject.addEventListener("load", () => {
        mapObject
          .getSVGDocument()
          .querySelector("path")
          .setAttribute("fill", "red");
      });
    </script>

SVG and external stylesheets

I found a few documents from W3C about SVG viewer conformance that clear some of this up:

SVG Viewer Conformance

Styling with CSS

Styling Alternatives

Common Facilities Used by SVG and CSS

I saw this line,

Conforming SVG Interpreters and Conforming SVG Viewers that support
CSS styling of generic (i.e., text-based) XML content are required to
also support CSS styling of SVG content.

which makes me believe that only SVG viewers that support CSS (as opposed to presentation attributes) are required to support external stylesheets - so basically just browsers.

I would still like to have a list of SVG software packages and whether each supports external stylesheets as well as how they assign styles, but maybe I will have to do this research for myself.

How to Style Svg With External Css