I'm not saying this is a perfect situation, but the truth is that html and css skills are somewhat less valuable for a web developer nowadays.
Just an example, this UI takes 35 lines of javascript code to be created using DHTMLX:
https://dhtmlx.com/docs/products/visualDesigner/live/?previe...
for those who want to play around:
https://dhtmlx.com/docs/products/visualDesigner/live/#c403w3