12 - If selection in d3.js
A line chart displays stock closing prices over time, with each data point colored by value: red below 400, orange between 400 and 620, and green above 620. The d3.v3 code parses CSV data and uses `d3.svg.line` for the path, `d3.time.scale` for dates, and `d3.svg.axis` for scales. Hovering over a circle triggers a tooltip showing the date and closing price, linking to a URL.
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forked from <a href='http://bl.ocks.org/adry34160/'>adry34160</a>'s block: <a href='http://bl.ocks.org/adry34160/4e6492eba6a7a5f5958579103b11aeba'>10 - Simple d3.js tooltip</a>
forked from <a href='http://bl.ocks.org/adry34160/'>adry34160</a>'s block: <a href='http://bl.ocks.org/adry34160/5d7fe0af1c6ca50c28aaeb4905bfaba9'>11 - Filtering in d3.js</a>