3 files changed, 11 insertions, 2 deletions
diff --git a/components/script/dom/webgl2renderingcontext.rs b/components/script/dom/webgl2renderingcontext.rs
index 4af734253af..b6a34dbc60a 100644
--- a/components/script/dom/webgl2renderingcontext.rs
+++ b/components/script/dom/webgl2renderingcontext.rs
@@ -1119,6 +1119,11 @@ impl WebGL2RenderingContextMethods for WebGL2RenderingContext {
         self.base.GetContextAttributes()
     }
 
+    // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.13
+    fn IsContextLost(&self) -> bool {
+        self.base.IsContextLost()
+    }
+
     /// https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.14
     fn GetSupportedExtensions(&self) -> Option<Vec<DOMString>> {
         self.base.GetSupportedExtensions()
diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index b4efd86033b..168d31fdf5d 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -2319,6 +2319,11 @@ impl WebGLRenderingContextMethods for WebGLRenderingContext {
         })
     }
 
+    // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.13
+    fn IsContextLost(&self) -> bool {
+        false
+    }
+
     // https://www.khronos.org/registry/webgl/specs/latest/1.0/#5.14.14
     fn GetSupportedExtensions(&self) -> Option<Vec<DOMString>> {
         self.extension_manager
diff --git a/components/script/dom/webidls/WebGLRenderingContext.webidl b/components/script/dom/webidls/WebGLRenderingContext.webidl
index ac00757ef3f..4003ab86ba5 100644
--- a/components/script/dom/webidls/WebGLRenderingContext.webidl
+++ b/components/script/dom/webidls/WebGLRenderingContext.webidl
@@ -470,8 +470,7 @@ interface mixin WebGLRenderingContextBase
     readonly attribute GLsizei drawingBufferHeight;
 
     [WebGLHandlesContextLoss] WebGLContextAttributes? getContextAttributes();
-    // FIXME: https://github.com/servo/servo/issues/15266
-    // [WebGLHandlesContextLoss] boolean isContextLost();
+    [WebGLHandlesContextLoss] boolean isContextLost();
 
     sequence<DOMString>? getSupportedExtensions();
     object? getExtension(DOMString name);