LibWeb: Make 2D and 3D canvas rendering contexts GC-allocated

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLGenerators.cpp

@@ -151,6 +151,10 @@ static bool impl_is_wrapper(Type const& type)
         return true;
     if (type.name == "MutationRecord"sv)
         return true;
+    if (type.name == "CanvasRenderingContext2D"sv)
+        return true;
+    if (type.name == "WebGLRenderingContext"sv)
+        return true;
 
     return false;
 }

Userland/Libraries/LibWeb/Forward.h

@@ -450,7 +450,6 @@ class URLSearchParamsIterator;
 namespace Web::Bindings {
 class BlobWrapper;
 class CanvasGradientWrapper;
-class CanvasRenderingContext2DWrapper;
 class CryptoWrapper;
 class DOMExceptionWrapper;
 class DOMPointWrapper;
@@ -478,7 +477,6 @@ class TextMetricsWrapper;
 class URLSearchParamsIteratorWrapper;
 class URLSearchParamsWrapper;
 class URLWrapper;
-class WebGLRenderingContextWrapper;
 class WindowProxy;
 class WorkerLocationWrapper;
 class WorkerNavigatorWrapper;

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.cpp

@@ -10,7 +10,7 @@
 #include <LibGfx/Painter.h>
 #include <LibGfx/Quad.h>
 #include <LibGfx/Rect.h>
-#include <LibWeb/Bindings/CanvasRenderingContext2DWrapper.h>
+#include <LibWeb/Bindings/CanvasRenderingContext2DPrototype.h>
 #include <LibWeb/DOM/ExceptionOr.h>
 #include <LibWeb/HTML/CanvasRenderingContext2D.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
@@ -23,13 +23,26 @@
 
 namespace Web::HTML {
 
-CanvasRenderingContext2D::CanvasRenderingContext2D(HTMLCanvasElement& element)
+JS::NonnullGCPtr<CanvasRenderingContext2D> CanvasRenderingContext2D::create(HTML::Window& window, HTMLCanvasElement& element)
-    : m_element(JS::make_handle(element))
 {
+    return *window.heap().allocate<CanvasRenderingContext2D>(window.realm(), window, element);
+}
+
+CanvasRenderingContext2D::CanvasRenderingContext2D(HTML::Window& window, HTMLCanvasElement& element)
+    : PlatformObject(window.realm())
+    , m_element(element)
+{
+    set_prototype(&window.ensure_web_prototype<Bindings::CanvasRenderingContext2DPrototype>("CanvasRenderingContext2D"));
 }
 
 CanvasRenderingContext2D::~CanvasRenderingContext2D() = default;
 
+void CanvasRenderingContext2D::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_element.ptr());
+}
+
 HTMLCanvasElement& CanvasRenderingContext2D::canvas_element()
 {
     return *m_element;
@@ -306,11 +319,7 @@ void CanvasRenderingContext2D::fill(Path2D& path, String const& fill_rule)
 
 RefPtr<ImageData> CanvasRenderingContext2D::create_image_data(int width, int height) const
 {
-    if (!wrapper()) {
+    return ImageData::create_with_size(vm(), width, height);
-        dbgln("Hmm! Attempted to create ImageData for wrapper-less CRC2D.");
-        return {};
-    }
-    return ImageData::create_with_size(wrapper()->vm(), width, height);
 }
 
 // https://html.spec.whatwg.org/multipage/canvas.html#dom-context-2d-getimagedata
@@ -326,7 +335,7 @@ DOM::ExceptionOr<RefPtr<ImageData>> CanvasRenderingContext2D::get_image_data(int
 
     // 3. Let imageData be a new ImageData object.
     // 4. Initialize imageData given sw, sh, settings set to settings, and defaultColorSpace set to this's color space.
-    auto image_data = ImageData::create_with_size(wrapper()->vm(), width, height);
+    auto image_data = ImageData::create_with_size(vm(), width, height);
 
     // NOTE: We don't attempt to create the underlying bitmap here; if it doesn't exist, it's like copying only transparent black pixels (which is a no-op).
     if (!canvas_element().bitmap())

Userland/Libraries/LibWeb/HTML/CanvasRenderingContext2D.h

@@ -7,14 +7,13 @@
 
 #pragma once
 
-#include <AK/RefCountForwarder.h>
 #include <AK/Variant.h>
 #include <LibGfx/AffineTransform.h>
 #include <LibGfx/Color.h>
 #include <LibGfx/Forward.h>
 #include <LibGfx/Painter.h>
 #include <LibGfx/Path.h>
-#include <LibWeb/Bindings/Wrappable.h>
+#include <LibWeb/Bindings/PlatformObject.h>
 #include <LibWeb/DOM/ExceptionOr.h>
 #include <LibWeb/HTML/Canvas/CanvasDrawImage.h>
 #include <LibWeb/HTML/Canvas/CanvasDrawPath.h>
@@ -37,8 +36,7 @@ namespace Web::HTML {
 using CanvasImageSource = Variant<JS::Handle<HTMLImageElement>, JS::Handle<HTMLCanvasElement>>;
 
 class CanvasRenderingContext2D
-    : public RefCounted<CanvasRenderingContext2D>
+    : public Bindings::PlatformObject
-    , public Bindings::Wrappable
     , public CanvasPath
     , public CanvasState
     , public CanvasTransform<CanvasRenderingContext2D>
@@ -50,14 +48,11 @@ class CanvasRenderingContext2D
     , public CanvasImageData
     , public CanvasPathDrawingStyles<CanvasRenderingContext2D> {
 
-    AK_MAKE_NONCOPYABLE(CanvasRenderingContext2D);
+    WEB_PLATFORM_OBJECT(CanvasRenderingContext2D, Bindings::PlatformObject);
-    AK_MAKE_NONMOVABLE(CanvasRenderingContext2D);
 
 public:
-    using WrapperType = Bindings::CanvasRenderingContext2DWrapper;
+    static JS::NonnullGCPtr<CanvasRenderingContext2D> create(HTML::Window&, HTMLCanvasElement&);
-
+    virtual ~CanvasRenderingContext2D() override;
-    static NonnullRefPtr<CanvasRenderingContext2D> create(HTMLCanvasElement& element) { return adopt_ref(*new CanvasRenderingContext2D(element)); }
-    ~CanvasRenderingContext2D();
 
     virtual void fill_rect(float x, float y, float width, float height) override;
     virtual void stroke_rect(float x, float y, float width, float height) override;
@@ -88,7 +83,9 @@ public:
     virtual void clip() override;
 
 private:
-    explicit CanvasRenderingContext2D(HTMLCanvasElement&);
+    explicit CanvasRenderingContext2D(HTML::Window&, HTMLCanvasElement&);
+
+    virtual void visit_edges(Cell::Visitor&) override;
 
     struct PreparedTextGlyph {
         unsigned int c;
@@ -112,7 +109,7 @@ private:
     void stroke_internal(Gfx::Path const&);
     void fill_internal(Gfx::Path&, String const& fill_rule);
 
-    JS::Handle<HTMLCanvasElement> m_element;
+    JS::NonnullGCPtr<HTMLCanvasElement> m_element;
 
     // https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean
     bool m_origin_clean { true };
@@ -127,3 +124,5 @@ DOM::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasImag
 bool image_is_not_origin_clean(CanvasImageSource const&);
 
 }
+
+WRAPPER_HACK(CanvasRenderingContext2D, Web::HTML)

Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.cpp

@@ -8,6 +8,7 @@
 #include <AK/Checked.h>
 #include <LibGfx/Bitmap.h>
 #include <LibGfx/PNGWriter.h>
+#include <LibWeb/Bindings/HTMLCanvasElementPrototype.h>
 #include <LibWeb/CSS/StyleComputer.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/CanvasRenderingContext2D.h>
@@ -21,10 +22,25 @@ static constexpr auto max_canvas_area = 16384 * 16384;
 HTMLCanvasElement::HTMLCanvasElement(DOM::Document& document, DOM::QualifiedName qualified_name)
     : HTMLElement(document, move(qualified_name))
 {
+    set_prototype(&document.window().ensure_web_prototype<Bindings::HTMLCanvasElementPrototype>("HTMLCanvasElement"));
 }
 
 HTMLCanvasElement::~HTMLCanvasElement() = default;
 
+void HTMLCanvasElement::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    m_context.visit(
+        [&](JS::NonnullGCPtr<CanvasRenderingContext2D>& context) {
+            visitor.visit(context.ptr());
+        },
+        [&](JS::NonnullGCPtr<WebGL::WebGLRenderingContext>& context) {
+            visitor.visit(context.ptr());
+        },
+        [](Empty) {
+        });
+}
+
 unsigned HTMLCanvasElement::width() const
 {
     return attribute(HTML::AttributeNames::width).to_uint().value_or(300);
@@ -38,10 +54,10 @@ unsigned HTMLCanvasElement::height() const
 void HTMLCanvasElement::reset_context_to_default_state()
 {
     m_context.visit(
-        [](NonnullRefPtr<CanvasRenderingContext2D>& context) {
+        [](JS::NonnullGCPtr<CanvasRenderingContext2D>& context) {
             context->reset_to_default_state();
         },
-        [](NonnullRefPtr<WebGL::WebGLRenderingContext>&) {
+        [](JS::NonnullGCPtr<WebGL::WebGLRenderingContext>&) {
             TODO();
         },
         [](Empty) {
@@ -71,22 +87,22 @@ RefPtr<Layout::Node> HTMLCanvasElement::create_layout_node(NonnullRefPtr<CSS::St
 HTMLCanvasElement::HasOrCreatedContext HTMLCanvasElement::create_2d_context()
 {
     if (!m_context.has<Empty>())
-        return m_context.has<NonnullRefPtr<CanvasRenderingContext2D>>() ? HasOrCreatedContext::Yes : HasOrCreatedContext::No;
+        return m_context.has<JS::NonnullGCPtr<CanvasRenderingContext2D>>() ? HasOrCreatedContext::Yes : HasOrCreatedContext::No;
 
-    m_context = CanvasRenderingContext2D::create(*this);
+    m_context = CanvasRenderingContext2D::create(window(), *this);
     return HasOrCreatedContext::Yes;
 }
 
 JS::ThrowCompletionOr<HTMLCanvasElement::HasOrCreatedContext> HTMLCanvasElement::create_webgl_context(JS::Value options)
 {
     if (!m_context.has<Empty>())
-        return m_context.has<NonnullRefPtr<WebGL::WebGLRenderingContext>>() ? HasOrCreatedContext::Yes : HasOrCreatedContext::No;
+        return m_context.has<JS::NonnullGCPtr<WebGL::WebGLRenderingContext>>() ? HasOrCreatedContext::Yes : HasOrCreatedContext::No;
 
-    auto maybe_context = TRY(WebGL::WebGLRenderingContext::create(*this, options));
+    auto maybe_context = TRY(WebGL::WebGLRenderingContext::create(window(), *this, options));
     if (!maybe_context)
         return HasOrCreatedContext::No;
 
-    m_context = maybe_context.release_nonnull();
+    m_context = JS::NonnullGCPtr<WebGL::WebGLRenderingContext>(*maybe_context);
     return HasOrCreatedContext::Yes;
 }
 
@@ -104,7 +120,7 @@ JS::ThrowCompletionOr<HTMLCanvasElement::RenderingContext> HTMLCanvasElement::ge
     // NOTE: See the spec for the full table.
     if (type == "2d"sv) {
         if (create_2d_context() == HasOrCreatedContext::Yes)
-            return m_context;
+            return JS::make_handle(*m_context.get<JS::NonnullGCPtr<HTML::CanvasRenderingContext2D>>());
 
         return Empty {};
     }
@@ -112,7 +128,7 @@ JS::ThrowCompletionOr<HTMLCanvasElement::RenderingContext> HTMLCanvasElement::ge
     // NOTE: The WebGL spec says "experimental-webgl" is also acceptable and must be equivalent to "webgl". Other engines accept this, so we do too.
     if (type.is_one_of("webgl"sv, "experimental-webgl"sv)) {
         if (TRY(create_webgl_context(options)) == HasOrCreatedContext::Yes)
-            return m_context;
+            return JS::make_handle(*m_context.get<JS::NonnullGCPtr<WebGL::WebGLRenderingContext>>());
 
         return Empty {};
     }
@@ -168,10 +184,10 @@ String HTMLCanvasElement::to_data_url(String const& type, [[maybe_unused]] Optio
 void HTMLCanvasElement::present()
 {
     m_context.visit(
-        [](NonnullRefPtr<CanvasRenderingContext2D>&) {
+        [](JS::NonnullGCPtr<CanvasRenderingContext2D>&) {
             // Do nothing, CRC2D writes directly to the canvas bitmap.
         },
-        [](NonnullRefPtr<WebGL::WebGLRenderingContext>& context) {
+        [](JS::NonnullGCPtr<WebGL::WebGLRenderingContext>& context) {
             context->present();
         },
         [](Empty) {

Userland/Libraries/LibWeb/HTML/HTMLCanvasElement.h

@@ -17,7 +17,7 @@ class HTMLCanvasElement final : public HTMLElement {
     WEB_PLATFORM_OBJECT(HTMLCanvasElement, HTMLElement);
 
 public:
-    using RenderingContext = Variant<NonnullRefPtr<CanvasRenderingContext2D>, NonnullRefPtr<WebGL::WebGLRenderingContext>, Empty>;
+    using RenderingContext = Variant<JS::Handle<CanvasRenderingContext2D>, JS::Handle<WebGL::WebGLRenderingContext>, Empty>;
 
     virtual ~HTMLCanvasElement() override;
 
@@ -40,6 +40,8 @@ public:
 private:
     HTMLCanvasElement(DOM::Document&, DOM::QualifiedName);
 
+    virtual void visit_edges(Cell::Visitor&) override;
+
     virtual RefPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;
 
     enum class HasOrCreatedContext {
@@ -52,7 +54,8 @@ private:
     void reset_context_to_default_state();
 
     RefPtr<Gfx::Bitmap> m_bitmap;
-    RenderingContext m_context;
+
+    Variant<JS::NonnullGCPtr<HTML::CanvasRenderingContext2D>, JS::NonnullGCPtr<WebGL::WebGLRenderingContext>, Empty> m_context;
 };
 
 }

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.cpp

@@ -4,9 +4,11 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
+#include <LibWeb/Bindings/WebGLRenderingContextPrototype.h>
 #include <LibWeb/Bindings/Wrapper.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
+#include <LibWeb/HTML/Window.h>
 #include <LibWeb/WebGL/WebGLContextEvent.h>
 #include <LibWeb/WebGL/WebGLRenderingContext.h>
 
@@ -30,7 +32,7 @@ static void fire_webgl_context_creation_error(HTML::HTMLCanvasElement& canvas_el
     fire_webgl_context_event(canvas_element, "webglcontextcreationerror"sv);
 }
 
-JS::ThrowCompletionOr<RefPtr<WebGLRenderingContext>> WebGLRenderingContext::create(HTML::HTMLCanvasElement& canvas_element, JS::Value options)
+JS::ThrowCompletionOr<JS::GCPtr<WebGLRenderingContext>> WebGLRenderingContext::create(HTML::Window& window, HTML::HTMLCanvasElement& canvas_element, JS::Value options)
 {
     // We should be coming here from getContext being called on a wrapped <canvas> element.
     auto context_attributes = TRY(convert_value_to_context_attributes_dictionary(canvas_element.vm(), options));
@@ -38,20 +40,29 @@ JS::ThrowCompletionOr<RefPtr<WebGLRenderingContext>> WebGLRenderingContext::crea
     bool created_bitmap = canvas_element.create_bitmap(/* minimum_width= */ 1, /* minimum_height= */ 1);
     if (!created_bitmap) {
         fire_webgl_context_creation_error(canvas_element);
-        return RefPtr<WebGLRenderingContext> { nullptr };
+        return JS::GCPtr<WebGLRenderingContext> { nullptr };
     }
 
 #ifndef __serenity__
     // FIXME: Make WebGL work on other platforms.
+    (void)window;
     (void)context_attributes;
     dbgln("FIXME: WebGL not supported on the current platform");
     fire_webgl_context_creation_error(canvas_element);
-    return RefPtr<WebGLRenderingContext> { nullptr };
+    return JS::GCPtr<WebGLRenderingContext> { nullptr };
 #else
     // FIXME: LibGL currently doesn't propagate context creation errors.
     auto context = GL::create_context(*canvas_element.bitmap());
-    return adopt_ref(*new WebGLRenderingContext(canvas_element, move(context), context_attributes, context_attributes));
+    return window.heap().allocate<WebGLRenderingContext>(window.realm(), window, canvas_element, move(context), context_attributes, context_attributes);
 #endif
 }
 
+WebGLRenderingContext::WebGLRenderingContext(HTML::Window& window, HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters)
+    : WebGLRenderingContextBase(window, canvas_element, move(context), move(context_creation_parameters), move(actual_context_parameters))
+{
+    set_prototype(&window.ensure_web_prototype<Bindings::WebGLRenderingContextPrototype>("WebGLRenderingContext"));
+}
+
+WebGLRenderingContext::~WebGLRenderingContext() = default;
+
 }

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContext.h

@@ -6,26 +6,22 @@
 
 #pragma once
 
-#include <LibWeb/Bindings/Wrappable.h>
 #include <LibWeb/WebGL/WebGLRenderingContextBase.h>
 
 namespace Web::WebGL {
 
-class WebGLRenderingContext
+class WebGLRenderingContext final : public WebGLRenderingContextBase {
-    : public WebGLRenderingContextBase
+    WEB_PLATFORM_OBJECT(WebGLRenderingContext, WebGLRenderingContextBase);
-    , public Bindings::Wrappable {
+
 public:
-    using WrapperType = Bindings::WebGLRenderingContextWrapper;
+    static JS::ThrowCompletionOr<JS::GCPtr<WebGLRenderingContext>> create(HTML::Window&, HTML::HTMLCanvasElement& canvas_element, JS::Value options);
 
-    static JS::ThrowCompletionOr<RefPtr<WebGLRenderingContext>> create(HTML::HTMLCanvasElement& canvas_element, JS::Value options);
+    virtual ~WebGLRenderingContext() override;
-
-    virtual ~WebGLRenderingContext() override = default;
 
 private:
-    WebGLRenderingContext(HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters)
+    WebGLRenderingContext(HTML::Window&, HTML::HTMLCanvasElement&, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters);
-        : WebGLRenderingContextBase(canvas_element, move(context), move(context_creation_parameters), move(actual_context_parameters))
-    {
-    }
 };
 
 }
+
+WRAPPER_HACK(WebGLRenderingContext, Web::WebGL)

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.cpp

@@ -7,12 +7,14 @@
 #include <AK/Debug.h>
 #include <LibGL/GLContext.h>
 #include <LibWeb/HTML/HTMLCanvasElement.h>
+#include <LibWeb/HTML/Window.h>
 #include <LibWeb/WebGL/WebGLRenderingContextBase.h>
 
 namespace Web::WebGL {
 
-WebGLRenderingContextBase::WebGLRenderingContextBase(HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters)
+WebGLRenderingContextBase::WebGLRenderingContextBase(HTML::Window& window, HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters)
-    : m_canvas_element(canvas_element)
+    : PlatformObject(window.realm())
+    , m_canvas_element(canvas_element)
     , m_context(move(context))
     , m_context_creation_parameters(move(context_creation_parameters))
     , m_actual_context_parameters(move(actual_context_parameters))
@@ -21,6 +23,12 @@ WebGLRenderingContextBase::WebGLRenderingContextBase(HTML::HTMLCanvasElement& ca
 
 WebGLRenderingContextBase::~WebGLRenderingContextBase() = default;
 
+void WebGLRenderingContextBase::visit_edges(Cell::Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_canvas_element.ptr());
+}
+
 #define RETURN_WITH_WEBGL_ERROR_IF(condition, error)                         \
     if (condition) {                                                         \
         dbgln_if(WEBGL_CONTEXT_DEBUG, "{}(): error {:#x}", __func__, error); \

Userland/Libraries/LibWeb/WebGL/WebGLRenderingContextBase.h

@@ -15,9 +15,9 @@
 
 namespace Web::WebGL {
 
-class WebGLRenderingContextBase
+class WebGLRenderingContextBase : public Bindings::PlatformObject {
-    : public RefCounted<WebGLRenderingContextBase>
+    WEB_PLATFORM_OBJECT(WebGLRenderingContextBase, Bindings::PlatformObject);
-    , public Weakable<WebGLRenderingContextBase> {
+
 public:
     virtual ~WebGLRenderingContextBase();
 
@@ -62,10 +62,12 @@ public:
     void viewport(GLint x, GLint y, GLsizei width, GLsizei height);
 
 protected:
-    WebGLRenderingContextBase(HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters);
+    WebGLRenderingContextBase(HTML::Window&, HTML::HTMLCanvasElement& canvas_element, NonnullOwnPtr<GL::GLContext> context, WebGLContextAttributes context_creation_parameters, WebGLContextAttributes actual_context_parameters);
 
 private:
-    JS::Handle<HTML::HTMLCanvasElement> m_canvas_element;
+    virtual void visit_edges(Cell::Visitor&) override;
+
+    JS::NonnullGCPtr<HTML::HTMLCanvasElement> m_canvas_element;
 
     NonnullOwnPtr<GL::GLContext> m_context;
 

Userland/Libraries/LibWeb/idl_files.cmake

@@ -62,7 +62,7 @@ libweb_js_wrapper(Geometry/DOMRect)
 libweb_js_wrapper(Geometry/DOMRectList)
 libweb_js_wrapper(Geometry/DOMRectReadOnly)
 libweb_js_wrapper(HTML/CanvasGradient)
-libweb_js_wrapper(HTML/CanvasRenderingContext2D)
+libweb_js_wrapper(HTML/CanvasRenderingContext2D NO_INSTANCE)
 libweb_js_wrapper(HTML/CloseEvent NO_INSTANCE)
 libweb_js_wrapper(HTML/DOMParser NO_INSTANCE)
 libweb_js_wrapper(HTML/DOMStringMap NO_INSTANCE)
@@ -183,7 +183,7 @@ libweb_js_wrapper(UIEvents/UIEvent NO_INSTANCE)
 libweb_js_wrapper(URL/URL)
 libweb_js_wrapper(URL/URLSearchParams ITERABLE)
 libweb_js_wrapper(WebGL/WebGLContextEvent NO_INSTANCE)
-libweb_js_wrapper(WebGL/WebGLRenderingContext)
+libweb_js_wrapper(WebGL/WebGLRenderingContext NO_INSTANCE)
 libweb_js_wrapper(WebSockets/WebSocket NO_INSTANCE)
 libweb_js_wrapper(XHR/ProgressEvent NO_INSTANCE)
 libweb_js_wrapper(XHR/XMLHttpRequest NO_INSTANCE)