Normalized stacked barchart is similiar to ordinary stacked barchart, only that it displays data in percentage, instead of the usual bar-height-by-value.
This example shows browser usage statistic from 2002 – 2016 (sorry, no 2017 data just yet – this section has not been updated for a very long time, gotta remember this!). The data is from w3schools.
Hover on bar segment(s) to display data, use the slider below to choose year data.
I found it easier to hover on the smaller bar segments if the view is wider/larger, as you can see by click below.