#include #include // weird behavior void example_bad() { static constexpr const char *HTML = R"_(

some text

)_"; QWebEngineView *view = new QWebEngineView; view->setWindowTitle("weird behavior"); view->setHtml(HTML); view->show(); } // ok void example_good() { static constexpr const char *HTML = R"_(

)_"; QWebEngineView *view = new QWebEngineView; view->setWindowTitle("ok"); view->setHtml(HTML); view->show(); } int main(int argc, char *argv[]) { QApplication a(argc, argv); example_bad(); // example_good(); return a.exec(); }