diff --git a/doc/changelog.dox b/doc/changelog.dox
index 638a2fe13..8df52aa7c 100644
--- a/doc/changelog.dox
+++ b/doc/changelog.dox
@@ -285,6 +285,10 @@ See also:
     @ref Platform::WindowlessGlxApplication,
     @ref Platform::WindowlessWglApplication and
     @ref Platform::Sdl2Application
+-   New @ref Platform::EmscriptenApplication::GLConfiguration::Flag::PowerPreferenceLowPower
+    and @relativeref{Platform::EmscriptenApplication::GLConfiguration,Flag::PowerPreferenceHighPerformance}
+    flags allowing to pick either a low power, high performance or default
+    behavior (see [mosra/magnum#500](https://github.com/mosra/magnum/issues/500)).
 
 @subsubsection changelog-latest-new-scenegraph SceneGraph library
 
@@ -1181,6 +1185,11 @@ See also:
     @ref MeshTools::reference() and @ref MeshTools::mutableReference() were
     moved there as well, with @cpp Magnum/MeshTools/Reference.h @ce being a
     deprecated alias now.
+-   @cpp Platform::EmscriptenApplication::GLConfiguration::Flag::PreferLowPowerToHighPerformance @ce
+    is deprecated as it didn't allow explicitly choosing between high
+    performance and a default, use @relativeref{Platform::EmscriptenApplication::GLConfiguration,Flag::PowerPreferenceLowPower}
+    or @relativeref{Platform::EmscriptenApplication::GLConfiguration,Flag::PowerPreferenceHighPerformance}
+    instead
 -   @cpp Shaders::DistanceFieldVector @ce, @cpp Shaders::Flat @ce,
     @cpp Shaders::Generic @ce, @cpp Shaders::MeshVisualizer2D @ce,
     @cpp Shaders::MeshVisualizer3D @ce, @cpp Shaders::Phong @ce,
diff --git a/src/Magnum/Platform/EmscriptenApplication.cpp b/src/Magnum/Platform/EmscriptenApplication.cpp
index 2ddbc2129..20fc3d675 100644
--- a/src/Magnum/Platform/EmscriptenApplication.cpp
+++ b/src/Magnum/Platform/EmscriptenApplication.cpp
@@ -341,9 +341,12 @@ bool EmscriptenApplication::tryCreate(const Configuration& configuration, const
         !!(glConfiguration.flags() & GLConfiguration::Flag::PremultipliedAlpha);
     attrs.preserveDrawingBuffer =
         !!(glConfiguration.flags() & GLConfiguration::Flag::PreserveDrawingBuffer);
-    attrs.powerPreference =
-        !!(glConfiguration.flags() & GLConfiguration::Flag::PreferLowPowerToHighPerformance)
-        ? EM_WEBGL_POWER_PREFERENCE_LOW_POWER : EM_WEBGL_POWER_PREFERENCE_HIGH_PERFORMANCE;
+    if(glConfiguration.flags() & GLConfiguration::Flag::PowerPreferenceLowPower)
+        attrs.powerPreference = EM_WEBGL_POWER_PREFERENCE_LOW_POWER;
+    else if(glConfiguration.flags() & GLConfiguration::Flag::PowerPreferenceHighPerformance)
+        attrs.powerPreference = EM_WEBGL_POWER_PREFERENCE_HIGH_PERFORMANCE;
+    else
+        attrs.powerPreference = EM_WEBGL_POWER_PREFERENCE_DEFAULT;
     attrs.explicitSwapControl =
         !!(glConfiguration.flags() & GLConfiguration::Flag::ExplicitSwapControl);
     attrs.failIfMajorPerformanceCaveat =
diff --git a/src/Magnum/Platform/EmscriptenApplication.h b/src/Magnum/Platform/EmscriptenApplication.h
index 460bda981..b91044565 100644
--- a/src/Magnum/Platform/EmscriptenApplication.h
+++ b/src/Magnum/Platform/EmscriptenApplication.h
@@ -51,6 +51,7 @@
 #endif
 
 #ifdef MAGNUM_BUILD_DEPRECATED
+#include <Corrade/Utility/Macros.h>
 /* Some APIs used to take or return a std::string before */
 #include <Corrade/Containers/StringStl.h>
 #endif
@@ -967,10 +968,30 @@ class EmscriptenApplication::GLConfiguration: public GL::Context::Configuration
             PreserveDrawingBuffer = 1 << 1,
 
             /**
-             * Prefer low power to high performance. If set, the WebGL power
-             * preference will be set to reduce power consumption.
+             * Low power preference. Only at most one of
+             * @ref Flag::PowerPreferenceLowPower and
+             * @ref Flag::PowerPreferenceHighPerformance should be set. If
+             * neither is set, a default is used.
+             * @m_since_latest
+             */
+            PowerPreferenceLowPower = 1 << 2,
+
+            /**
+             * High performace power preference. Only at most one of
+             * @ref Flag::PowerPreferenceLowPower and
+             * @ref Flag::PowerPreferenceHighPerformance should be set. If
+             * neither is set, a default is used.
+             * @m_since_latest
              */
-            PreferLowPowerToHighPerformance = 1 << 2,
+            PowerPreferenceHighPerformance = 1 << 3,
+
+            #ifdef MAGNUM_BUILD_DEPRECATED
+            /**
+             * Prefer low power to high performance
+             * @m_deprecated_since_latest Use @ref Flag::PowerPreferenceLowPower instead.
+             */
+            PreferLowPowerToHighPerformance CORRADE_DEPRECATED_ENUM("use Flag::PowerPreferenceLowPower instead") = PowerPreferenceLowPower,
+            #endif
 
             /**
              * Fail if major performance caveat. If set, requests context
@@ -978,32 +999,32 @@ class EmscriptenApplication::GLConfiguration: public GL::Context::Configuration
              * context that does not give good hardware-accelerated
              * performance.
              */
-            FailIfMajorPerformanceCaveat = 1 << 3,
+            FailIfMajorPerformanceCaveat = 1 << 4,
 
             /**
              * Explicit swap control. For more details, see the
              * [Emscripten API reference](https://emscripten.org/docs/api_reference/html5.h.html#c.EmscriptenWebGLContextAttributes.explicitSwapControl).
              */
-            ExplicitSwapControl = 1 << 4,
+            ExplicitSwapControl = 1 << 5,
 
             /**
              * Enable WebGL extensions by default. Enabled by default. For more
              * details, see @ref Platform-EmscriptenApplication-webgl and the
              * [Emscripten API reference](https://emscripten.org/docs/api_reference/html5.h.html#c.EmscriptenWebGLContextAttributes.enableExtensionsByDefault).
              */
-            EnableExtensionsByDefault = 1 << 5,
+            EnableExtensionsByDefault = 1 << 6,
 
             /**
              * Render via offscreen back buffer. For more details, see the
              * [Emscripten API reference](https://emscripten.org/docs/api_reference/html5.h.html#c.EmscriptenWebGLContextAttributes.renderViaOffscreenBackBuffer).
              */
-            RenderViaOffscreenBackBuffer = 1 << 6,
+            RenderViaOffscreenBackBuffer = 1 << 7,
 
             /**
              * Proxy content to main thread. For more details, see the
              * [Emscripten API reference](https://emscripten.org/docs/api_reference/html5.h.html#c.EmscriptenWebGLContextAttributes.proxyContextToMainThread).
              */
-            ProxyContextToMainThread = 1 << 7,
+            ProxyContextToMainThread = 1 << 8,
 
             /**
              * @copydoc GL::Context::Configuration::Flag::QuietLog