The new Microsoft Edge is built on the Chromium engine, and will officially launch on January 15th 2020.
With their move to the new Chromium engine for Microsoft Edge, they have added an ability to open web sites in Internet Explorer mode in a new tab directly inside the Edge browser. Internet Explorer mode allows users to navigate seamlessly from a modern web application to one that requires legacy HTML or plugins. You’ll no longer need a “two-browser” solution.
edge://flags/#edge-internet-explorer-integrationinto the address bar of Edge.
--ie-mode-testoption after “…\msedge.exe”
Now Edge will open a new tab in Internet Explorer mode once the above option is selected (an info bar will say All sites in this tab will be opened in Internet Explorer mode).