The `.sel` property of a virtual node is the CSS selector passed to [`h()`](#snabbdomh) during creation.
For example: `h('div#container', {}, [...])` will create a a virtual node which has `div#container` as it's `.sel` property.
For example: `h('div#container', {}, [...])` will create a a virtual node which has `div#container` as its `.sel` property.
#### data : Object
The `.data` property of a virtual node is the place to add information for [modules](#modules-documentation) to access and manipulate the real DOM element when it is created; Add styles, CSS classes, attributes, etc.