path: qtwebengine-opensource-src_5.15.19+dfsg2-2/src/3rdparty/chromium/docs/testing/web_tests_linux.md
1.  `XEPHYR_PAUSE=$((500*1000)) Xephyr ...etc...  # 500 ms repaint flash`
1.  `kill -USR1 $(pidof Xephyr)`
If you don't want to see anything at all, you can use Xvfb (should already be


path: qtwebengine-opensource-src_5.15.19+dfsg2-2/src/3rdparty/chromium/docs/linux/profiling.md
Xephyr to start drawing red rectangles:
    kill -USR1 `pidof Xephyr`
For further information, please refer to