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## <iron-doc-viewer>

A collection of elements that display documentation about custom elements,
mixins, classes, and more using the JSON descriptor format produced by [Polymer
Analyzer](https://github.com/Polymer/polymer-analyzer).

You may also be interested in
[`<iron-component-page>`](https://github.com/PolymerElements/iron-component-page),
which composes the iron-doc elements into a more complete documentation
browser.

### Elements

* `<iron-doc-nav>` Show a table-of-contents.
* `<iron-doc-viewer>` Manage routing and delegate to a child doc element.
* `<iron-doc-element>` Show docs about a custom element.
* `<iron-doc-behavior>` Show docs about a Polymer behavior.
* `<iron-doc-namespace>` Show docs about a JavaScript namespace.
* `<iron-doc-class>` Show docs about a JavaScript class.
* `<iron-doc-mixin>` Show docs about a JavaScript mixin.

### Routing

`<iron-doc-viewer>` handles URL routing to provide permanent addresses for all
locations in the documentation tree, including scroll anchor targets.

By default it uses the URL fragment for routing (e.g.
`docs.html#/elements/my-element#property-foo`), in order to support simple
static file hosts.

To use the real URL path for routing, set the `base-href` property to the
server mount point, omitting the trailing slash (e.g. `/api/docs` or *empty
string* for the root path). Note that this requires a host that serves the
application from all paths that should be handled by the doc viewer.

### Styling

The iron-doc elements come with an optional material-design default theme that
must be explicitly included as custom style:

```html
<link rel="import" href="../iron-doc-viewer/default-theme.html">

<custom-style>
  <style is="custom-style" include="iron-doc-default-theme"></style>
</custom-style>
```

The following custom properties and mixins are available for styling:

Custom property | Description | Default
----------------|-------------|----------
`--iron-doc-accent-color` | Color for emphasis (e.g. hyperlink hover). | `#1565c0`
`--iron-doc-font-body` | Mixin applied to non-code text. | `{}`
`--iron-doc-font-code` | Mixin applied to code snippets. | `{}`
`--iron-doc-title` | Mixin applied to page titles. | `{}`
`--iron-doc-heading` | Mixin applied to section headings. | `{}`

### Previous versions

The 3.x `iron-doc` elements described here have major breaking changes versus
the 1.x and 2.x versions. Previous versions were based on *Hydrolysis*, the
predecessor to Polymer Analyzer. Hydrolysis is no longer maintained and does
not support analysis of Polymer 2 elements.

If you still need the previous version, see the
[2.x branch](https://github.com/PolymerElements/iron-doc-viewer/tree/2.x).