WebAssembly

KDDockWidgets works with WebAssembly with the following known limitations:

Classic drop indicators are not supported, only the segmented ones. This is because WASM doesn't support windows with translucency.
Might be slow on Linux, depending on your browser, while dragging or resizing windows. Please file a bug with Qt, as it's out of scope for KDDW to fix.

Demo:

A demo is available at https://demos.kdab.com/wasm/kddockwidgets/dockwidgets.html

Build tips for KDDW:

Visit https://doc.qt.io/qt-5/wasm.html if you haven't yet
Open a terminal suitable for WASM development (with the correct Qt and toolchain in PATH, etc)
KDDockWidgets can be built with cmake -DCMAKE_TOOLCHAIN_FILE=/usr/local/emsdk-1.39.8/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake -DCMAKE_FIND_ROOT_PATH=~/Qt/5.15.1/wasm_32/ -DKDDockWidgets_EXAMPLES=OFF -DCMAKE_BUILD_TYPE=Release (Adapt the paths to your own situation)

Builds tips for your own app:

Link to KDDW (libkddockwidgets.a, or similar)
As the build is static, don't forget to initialize KDDW's resources:

#ifdef QT_STATIC
    Q_INIT_RESOURCE(kddockwidgets_resources);
#endif