1 files changed, 6 insertions, 2 deletions
diff --git a/src/gui/opengl/qopenglfunctions.cpp b/src/gui/opengl/qopenglfunctions.cpp
index 8ec814296a..bc3a4f7c1d 100644
--- a/src/gui/opengl/qopenglfunctions.cpp
+++ b/src/gui/opengl/qopenglfunctions.cpp
@@ -388,8 +388,12 @@ static int qt_gl_resolve_extensions()
                 | QOpenGLExtensions::MapBufferRange
                 | QOpenGLExtensions::FramebufferBlit
                 | QOpenGLExtensions::FramebufferMultisample
-                | QOpenGLExtensions::Sized8Formats
-                | QOpenGLExtensions::TextureSwizzle;
+                | QOpenGLExtensions::Sized8Formats;
+#ifndef Q_OS_WASM
+            // WebGL 2.0 specification explicitly does not support texture swizzles
+            // https://www.khronos.org/registry/webgl/specs/latest/2.0/#5.19
+            extensions |= QOpenGLExtensions::TextureSwizzle;
+#endif
         } else {
             // Recognize features by extension name.
             if (extensionMatcher.match("GL_OES_packed_depth_stencil"))