diff --git a/webrender/res/brush_yuv_image.glsl b/webrender/res/brush_yuv_image.glsl
index a8407acfa2..efb060fece 100644
--- a/webrender/res/brush_yuv_image.glsl
+++ b/webrender/res/brush_yuv_image.glsl
@@ -41,6 +41,12 @@ varying vec2 vLocalPos;
     flat varying vec4 vUvBounds_YUV;
 #endif
 
+#ifdef WR_FEATURE_TEXTURE_RECT
+    #define TEX_SIZE(sampler) vec2(1.0)
+#else
+    #define TEX_SIZE(sampler) vec2(textureSize(sampler, 0).xy)
+#endif
+
 #ifdef WR_VERTEX_SHADER
 void write_uv_rect(
     int resource_id,
@@ -78,14 +84,14 @@ void brush_vs(
 #endif
 
 #if defined (WR_FEATURE_YUV_PLANAR)
-    write_uv_rect(user_data.x, f, vec2(textureSize(sColor0, 0).xy), vUv_Y, vUvBounds_Y);
-    write_uv_rect(user_data.y, f, vec2(textureSize(sColor1, 0).xy), vUv_U, vUvBounds_U);
-    write_uv_rect(user_data.z, f, vec2(textureSize(sColor2, 0).xy), vUv_V, vUvBounds_V);
+    write_uv_rect(user_data.x, f, TEX_SIZE(sColor0), vUv_Y, vUvBounds_Y);
+    write_uv_rect(user_data.y, f, TEX_SIZE(sColor1), vUv_U, vUvBounds_U);
+    write_uv_rect(user_data.z, f, TEX_SIZE(sColor2), vUv_V, vUvBounds_V);
 #elif defined (WR_FEATURE_YUV_NV12)
-    write_uv_rect(user_data.x, f, vec2(textureSize(sColor0, 0).xy), vUv_Y, vUvBounds_Y);
-    write_uv_rect(user_data.y, f, vec2(textureSize(sColor1, 0).xy), vUv_UV, vUvBounds_UV);
+    write_uv_rect(user_data.x, f, TEX_SIZE(sColor0), vUv_Y, vUvBounds_Y);
+    write_uv_rect(user_data.y, f, TEX_SIZE(sColor1), vUv_UV, vUvBounds_UV);
 #elif defined (WR_FEATURE_YUV_INTERLEAVED)
-    write_uv_rect(user_data.x, f, vec2(textureSize(sColor0, 0).xy), vUv_YUV, vUvBounds_YUV);
+    write_uv_rect(user_data.x, f, TEX_SIZE(sColor0), vUv_YUV, vUvBounds_YUV);
 #endif //WR_FEATURE_YUV_*
 }
 #endif
diff --git a/webrender/res/shared.glsl b/webrender/res/shared.glsl
index 6d1b942d44..0946941ffb 100644
--- a/webrender/res/shared.glsl
+++ b/webrender/res/shared.glsl
@@ -14,16 +14,9 @@
 
 #include base
 
-// The textureLod() doesn't support samplerExternalOES for WR_FEATURE_TEXTURE_EXTERNAL.
-// https://www.khronos.org/registry/OpenGL/extensions/OES/OES_EGL_image_external_essl3.txt
-//
-// The textureLod() doesn't support sampler2DRect for WR_FEATURE_TEXTURE_RECT, too.
-//
-// Use texture() instead.
 #if defined(WR_FEATURE_TEXTURE_EXTERNAL) || defined(WR_FEATURE_TEXTURE_RECT) || defined(WR_FEATURE_TEXTURE_2D)
 #define TEX_SAMPLE(sampler, tex_coord) texture(sampler, tex_coord.xy)
 #else
-// In normal case, we use textureLod(). We haven't used the lod yet. So, we always pass 0.0 now.
 #define TEX_SAMPLE(sampler, tex_coord) texture(sampler, tex_coord)
 #endif
 
diff --git a/webrender/tests/angle_shader_validation.rs b/webrender/tests/angle_shader_validation.rs
index baf91e9dcc..3f57b6d700 100644
--- a/webrender/tests/angle_shader_validation.rs
+++ b/webrender/tests/angle_shader_validation.rs
@@ -73,7 +73,7 @@ const SHADERS: &[Shader] = &[
     // Brush shaders
     Shader {
         name: "brush_yuv_image",
-        features: &["", "YUV_NV12", "YUV_PLANAR", "YUV_INTERLEAVED"],
+        features: &["", "YUV_NV12", "YUV_PLANAR", "YUV_INTERLEAVED", "YUV_NV12,TEXTURE_RECT"],
     },
     Shader {
         name: "brush_mask",