Add html, svg, xml.

Fixes #14.

Author: mbostock

README.md

@@ -69,6 +69,10 @@ If only one of *init* and *row* is specified, it is interpreted as the *row* con
 
 See also [d3.csv](#csv) and [d3.tsv](#tsv).
 
+<a name="html" href="#html">#</a> d3.<b>html</b>(<i>input</i>[, <i>init</i>]) [<>](https://github.com/d3/d3-fetch/blob/master/src/xml.js "Source")
+
+Fetches the file at the specified *input* URL as [text](#text) and then [parses it](https://developer.mozilla.org/docs/Web/API/DOMParser) as HTML. If *init* is specified, it is passed along to the underlying call to [fetch](https://fetch.spec.whatwg.org/#fetch-method); see [RequestInit](https://fetch.spec.whatwg.org/#requestinit) for allowed fields.
+
 <a name="image" href="#image">#</a> d3.<b>image</b>(<i>input</i>[, <i>init</i>]) [<>](https://github.com/d3/d3-fetch/blob/master/src/image.js "Source")
 
 Fetches the image at the specified *input* URL. If *init* is specified, sets any additional properties on the image before loading. For example, to enable an anonymous [cross-origin request](https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image):
@@ -83,10 +87,18 @@ d3.image("https://example.com/test.png", {crossOrigin: "anonymous"}).then(functi
 
 Fetches the [JSON](http://json.org) file at the specified *input* URL. If *init* is specified, it is passed along to the underlying call to [fetch](https://fetch.spec.whatwg.org/#fetch-method); see [RequestInit](https://fetch.spec.whatwg.org/#requestinit) for allowed fields.
 
+<a name="svg" href="#svg">#</a> d3.<b>svg</b>(<i>input</i>[, <i>init</i>]) [<>](https://github.com/d3/d3-fetch/blob/master/src/xml.js "Source")
+
+Fetches the file at the specified *input* URL as [text](#text) and then [parses it](https://developer.mozilla.org/docs/Web/API/DOMParser) as SVG. If *init* is specified, it is passed along to the underlying call to [fetch](https://fetch.spec.whatwg.org/#fetch-method); see [RequestInit](https://fetch.spec.whatwg.org/#requestinit) for allowed fields.
+
 <a name="text" href="#text">#</a> d3.<b>text</b>(<i>input</i>[, <i>init</i>]) [<>](https://github.com/d3/d3-fetch/blob/master/src/text.js "Source")
 
 Fetches the text file at the specified *input* URL. If *init* is specified, it is passed along to the underlying call to [fetch](https://fetch.spec.whatwg.org/#fetch-method); see [RequestInit](https://fetch.spec.whatwg.org/#requestinit) for allowed fields.
 
 <a name="tsv" href="#tsv">#</a> d3.<b>tsv</b>(<i>input</i>[, <i>init</i>][, <i>row</i>]) [<>](https://github.com/d3/d3-fetch/blob/master/src/dsv.js "Source")
 
 Equivalent to [d3.dsv](#dsv) with the tab character as the delimiter.
+
+<a name="xml" href="#xml">#</a> d3.<b>xml</b>(<i>input</i>[, <i>init</i>]) [<>](https://github.com/d3/d3-fetch/blob/master/src/xml.js "Source")
+
+Fetches the file at the specified *input* URL as [text](#text) and then [parses it](https://developer.mozilla.org/docs/Web/API/DOMParser) as XML. If *init* is specified, it is passed along to the underlying call to [fetch](https://fetch.spec.whatwg.org/#fetch-method); see [RequestInit](https://fetch.spec.whatwg.org/#requestinit) for allowed fields.

index.js

@@ -4,3 +4,4 @@ export {default as dsv, csv, tsv} from "./src/dsv";
 export {default as image} from "./src/image";
 export {default as json} from "./src/json";
 export {default as text} from "./src/text";
+export {default as xml, html, svg} from "./src/xml";

src/xml.js

@@ -0,0 +1,15 @@
+import text from "./text";
+
+function parser(type) {
+  return function(input, init)  {
+    return text(input, init).then(function(text) {
+      return (new DOMParser).parseFromString(text, type);
+    });
+  };
+}
+
+export default parser("application/xml");
+
+export var html = parser("text/html");
+
+export var svg = parser("image/svg+xml");