Half float attributes are available on WebGL 2.

doc/changelog.dox

@@ -81,6 +81,7 @@ See also:
     shader sources containing Unicode characters to be truncated to empty
     strings. See the @cpp "emscripten-pthreads-broken-unicode-shader-sources" @ce
     workaround description for details.
+-   @ref Attribute::DataType::HalfFloat was not available on WebGL 2 by mistake
 
 @subsection changelog-latest-deprecated Deprecated APIs
 

src/Magnum/Attribute.h

@@ -416,7 +416,7 @@ class DynamicAttribute {
             UnsignedInt = GL_UNSIGNED_INT,      /**< Unsigned int */
             Int = GL_INT,                       /**< Int */
 
-            #ifndef MAGNUM_TARGET_WEBGL
+            #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
             /**
              * Half float. Only for float attribute types.
              * @requires_gl30 Extension @extension{ARB,half_float_vertex}