Release v0.10.0-rc.1 (#1654)

Bump master to v0.10.0-pre

website/versioned_docs/version-0.10.0-rc.1/api.md

@@ -0,0 +1,44 @@
+---
+id: version-0.10.0-rc.1-api
+title: API
+original_id: api
+---
+## In-browser rendering
+Call `katex.render` with a TeX expression and a DOM element to render into:
+
+```js
+katex.render("c = \\pm\\sqrt{a^2 + b^2}", element, {
+    throwOnError: false
+});
+```
+
+To avoid escaping the backslash (double backslash), you can use
+[`String.raw`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/raw)
+(but beware that `${`, `\u` and `\x` may still need escaping):
+```js
+katex.render(String.raw`c = \pm\sqrt{a^2 + b^2}`, element, {
+    throwOnError: false
+});
+```
+
+## Server-side rendering or rendering to a string
+To generate HTML on the server or to generate an HTML string of the rendered math, you can use `katex.renderToString`:
+
+```js
+var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}", {
+    throwOnError: false
+});
+// '<span class="katex">...</span>'
+```
+
+## Handling errors
+
+The examples above use the `throwOnError: false` option, which renders invalid
+inputs as the TeX source code in red (by default), with the error message as
+hover text.  Without this option, invalid LaTeX will cause a
+`katex.ParseError` exception to be thrown.  See [handling errors](error.md).
+
+## Configuring KaTeX
+
+The last argument to `katex.render` and `katex.renderToString` can contain
+[a variety of rendering options](options.md).