[WinCairo] backdrop-filter support r264968 added TextureMapper backdrop-filter support. Bug 169988 – [GTK][WPE] Support for backdrop-filter It should be easy to enable the feature for GraphicsLayerTextureMapper. https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter https://webkit.org/demos/backdrop-filter/
Created attachment 409969 [details] WIP patch (Umm, this patch not working)
Created attachment 410095 [details] WIP patch This patch has a bug. Sometime it needs repainting by resizing the browser window to render the backdrop filter.
Created attachment 410816 [details] WIP patch
Created attachment 410916 [details] Patch
Committed r268281: <https://trac.webkit.org/changeset/268281>
<rdar://problem/70149577>