Merge pull request #262 from d3/examples-links

example links

README.md

@@ -463,7 +463,7 @@ See [namespace](#namespace) for details on supported namespace prefixes, such as
 
 For an introduction to D3’s data joins, see the [*selection*.join notebook](https://observablehq.com/@d3/selection-join). Also see [Thinking With Joins](http://bost.ocks.org/mike/join/).
 
-<a name="selection_data" href="#selection_data">#</a> <i>selection</i>.<b>data</b>([<i>data</i>[, <i>key</i>]]) · [Source](https://github.com/d3/d3-selection/blob/master/src/selection/data.js)
+<a name="selection_data" href="#selection_data">#</a> <i>selection</i>.<b>data</b>([<i>data</i>[, <i>key</i>]]) · [Source](https://github.com/d3/d3-selection/blob/master/src/selection/data.js), [Examples](https://observablehq.com/@d3/brushable-scatterplot)
 
 Binds the specified array of *data* with the selected elements, returning a new selection that represents the *update* selection: the elements successfully bound to data. Also defines the [enter](#selection_enter) and [exit](#selection_exit) selections on the returned selection, which can be used to add or remove elements to correspond to the new data. The specified *data* is an array of arbitrary values (*e.g.*, numbers or objects), or a function that returns an array of values for each group. When data is assigned to an element, it is stored in the property `__data__`, thus making the data “sticky” and available on re-selection.