Comment by noduerme

This is absolutely false. Stage resizing and browser hooks for window resize were fundamental in Flash. (only in Chrome after 2017 did those events stop being delivered until after the window resize finished; prior to that they were delivered per frame). For complex Flex/Flash/AIR apps, layouts could be animated into new positions on the fly at 60fps as windows resized. I wrote three completely separate game platforms in AS3, and a full web CMS platform with dozens of widgets, and a file system manager, with interfaces that were as responsive as what you'd get from modern css. In many ways, creating responsive grids with proper text and image reflow was much easier, especially if you wanted something to "break the grid" on certain layout sizes. This was at a time when float:left was the HTML standard for wrapping text around an image block. In Flash you could define sizes and a vector line for text to runaround an image. The text handling for responsive resize and layout was light years ahead of native browser text rendering. Multi-column text and drop caps existed first in Flash. Whole magazines were written in it. Speaking as a graphic designer as well as a coder, I think the JS SPA web is on the whole much less responsive than Flash SPAs were, because of the poor flex-and-grid paradigm we're currently saddled with. And it's visually far more constrained to as couple of @media queries.