3 files changed, 44 insertions, 7 deletions
diff --git a/platform/web/js/engine/features.js b/platform/web/js/engine/features.js
index f91a4eff81..b7c6c9d445 100644
--- a/platform/web/js/engine/features.js
+++ b/platform/web/js/engine/features.js
@@ -76,19 +76,19 @@ const Features = { // eslint-disable-line no-unused-vars
 	getMissingFeatures: function () {
 		const missing = [];
 		if (!Features.isWebGLAvailable(2)) {
-			missing.push('WebGL2');
+			missing.push('WebGL2 - Check web browser configuration and hardware support');
 		}
 		if (!Features.isFetchAvailable()) {
-			missing.push('Fetch');
+			missing.push('Fetch - Check web browser version');
 		}
 		if (!Features.isSecureContext()) {
-			missing.push('Secure Context');
+			missing.push('Secure Context - Check web server configuration (use HTTPS)');
 		}
 		if (!Features.isCrossOriginIsolated()) {
-			missing.push('Cross Origin Isolation');
+			missing.push('Cross Origin Isolation - Check web server configuration (send correct headers)');
 		}
 		if (!Features.isSharedArrayBufferAvailable()) {
-			missing.push('SharedArrayBuffer');
+			missing.push('SharedArrayBuffer - Check web server configuration (send correct headers)');
 		}
 		// Audio is normally optional since we have a dummy fallback.
 		return missing;
diff --git a/platform/web/js/libs/library_godot_webgl2.externs.js b/platform/web/js/libs/library_godot_webgl2.externs.js
new file mode 100644
index 0000000000..18d8d0815a
--- /dev/null
+++ b/platform/web/js/libs/library_godot_webgl2.externs.js
@@ -0,0 +1,36 @@
+
+/**
+ * @constructor OVR_multiview2
+ */
+function OVR_multiview2() {}
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.FRAMEBUFFER_ATTACHMENT_TEXTURE_NUM_VIEWS_OVR;
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.FRAMEBUFFER_ATTACHMENT_TEXTURE_BASE_VIEW_INDEX_OVR;
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.MAX_VIEWS_OVR;
+
+/**
+ * @type {number}
+ */
+OVR_multiview2.prototype.FRAMEBUFFER_INCOMPLETE_VIEW_TARGETS_OVR;
+
+/**
+ * @param {number} target
+ * @param {number} attachment
+ * @param {WebGLTexture} texture
+ * @param {number} level
+ * @param {number} baseViewIndex
+ * @param {number} numViews
+ * @return {void}
+ */
+OVR_multiview2.prototype.framebufferTextureMultiviewOVR = function(target, attachment, texture, level, baseViewIndex, numViews) {};
diff --git a/platform/web/js/libs/library_godot_webgl2.js b/platform/web/js/libs/library_godot_webgl2.js
index 365f712be7..ba990b3ee0 100644
--- a/platform/web/js/libs/library_godot_webgl2.js
+++ b/platform/web/js/libs/library_godot_webgl2.js
@@ -37,14 +37,15 @@ const GodotWebGL2 = {
 	godot_webgl2_glFramebufferTextureMultiviewOVR: function (target, attachment, texture, level, base_view_index, num_views) {
 		const context = GL.currentContext;
 		if (typeof context.multiviewExt === 'undefined') {
-			const ext = context.GLctx.getExtension('OVR_multiview2');
+			const /** OVR_multiview2 */ ext = context.GLctx.getExtension('OVR_multiview2');
 			if (!ext) {
 				console.error('Trying to call glFramebufferTextureMultiviewOVR() without the OVR_multiview2 extension');
 				return;
 			}
 			context.multiviewExt = ext;
 		}
-		context.multiviewExt.framebufferTextureMultiviewOVR(target, attachment, GL.textures[texture], level, base_view_index, num_views);
+		const /** OVR_multiview2 */ ext = context.multiviewExt;
+		ext.framebufferTextureMultiviewOVR(target, attachment, GL.textures[texture], level, base_view_index, num_views);
 	},
 };