Oh my god. This has got to be like 20 years in the making
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The cost of browsers not having extremely-basic things that they either started to implement then abandoned in a nigh-useless state (login, frames) or never even tried to have but really, really should have once it was clear "web apps" were here to stay (datasource-backed lists and tables, table sorting without more custom JS than a sort function, drag-n-drop) is truly enormous. Who knows how many millions of person-hours.