Thanks for this suggestion. We'll see if we can add this in at some point. In the meantime, you can actually get the cumulative ascent to any point on the route by using the section selector above the chart to select the part of the route you're interested in.
With the Hills profile visible below a route or in the More Detailed Profile screen, you can move the mouse pointer along the route and see the elevation at that point and the distance from the start of the route.
It would be useful for route planning (as a cyclist or walker) to also know the total cumulative ascent from the start of the route at each point on the route as you move the pointer, rather than just the total ascent for the whole route and the elevation at each point. When planning longer cycling routes, one of the factors in deciding how long to make the route for a day is how much ascent in total will be involved. 50 miles with about 2,000 feet total ascent (North Eastern France) is a totally different proposition to 50 miles with 11,000 feet total ascent (Southern Switzerland) for example! :-)
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