## Embedding a 3Dmol Viewer

A viewer can be automatically instantiated by simply assigning the class `viewer_3Dmoljs` to a `div`.
The viewer will be styled according to the containing `div`, so be sure to set a height and width.
The code below is all that is needed to create the displayed viewer.

    {@lang xml} <script src="https://3Dmol.org/build/3Dmol-min.js" async></script>
             <div style="height: 400px; width: 400px; position: relative;" class='viewer_3Dmoljs' data-pdb='2POR' data-backgroundcolor='0xffffff' data-style='stick'></div>

The contents of the viewer can be set and manipulated through the use of `data-` tags, as shown above. Supported tags include:

- data-pdb The value describes a PDB ID to be loaded into the viewer.
- data-href The value is a URL to a molecular data file.
- data-element The value is the id of an HTML element on the current page that has molecular data embedded in it.
- data-type The value is the file format (default pdb; can be pdb, sdf, xyz, mol2, or cube).
- data-backgroundcolor The background color (default black).
- data-select The value is an AtomSpec selection specification.
- data-style The value is a style specification.
- data-surface A surface style specification.
- data-labelres A residue label style specification.
- data-zoomto An AtomSpec selection specification to zoom to.

Multiple selections, styles, residue labels, and surfaces can be provided by appending a suffix
each tag. For example.

    {@lang xml}
            <div style="height: 400px; width: 400px; position: relative;" class='viewer_3Dmoljs' data-pdb='1YCR' data-backgroundcolor='0xffffff'
            data-select1='chain:A' data-style1='cartoon:color=spectrum' data-surface1='opacity:.7;color:white' data-select2='chain:B' data-style2='stick'></div>

    <div style="height: 400px; width: 400px; position: relative;" class='viewer_3Dmoljs' data-pdb='1YCR' data-backgroundcolor='0xffffff'
         data-select1='chain:A' data-style1='cartoon:color=spectrum' data-surface1='opacity:.7;color:white' data-select2='chain:B' data-style2='stick'></div>

Once created, the 3Dmol viewer can be accessed using the id of the container div in `$3Dmol.viewers`.