SciChart.js ships with ~40 JavaScript Chart Examples which you can browse, play with, view the source code and see related documentation. All of this is possible with the SciChart.js Examples Suite, which ships as part of the SciChart.js SDK
Demonstrates how to create custom data-point markers using SciChart.js, High Performance JavaScript Charts
Demonstrates how to use the FastLineRenderableSeries and the Data-Point Markers API to apply fast WebGL-rendered data point markers to a line series.
The Point-markers are created using the HTML Canvas or custom images, but applied to the line as a WebGL Texture, so it’s possible to render tens or hundreds of thousands of point-markers using this method.