Zoom plugin: x axis zoom doesn't work

[slioch]

Sorry if this is the wrong place, or has been answered elsewhere, but i'm trying to implement the ability to expand an area of a chart.js chart on the x-axis. Using the example (https://github.com/chartjs/chartjs-plugin-zoom) with script tags, and drag set to true, I can get the chart to expand on the y axis when I set the mode to 'y', but when set to 'x', it doesn't work Is there something obvious I should be doing?

Any help would be much appreciated.