fix: corner smoothing feature gate crash (#47785)

* fix: corner smoothing feature gate crash

Co-authored-by: clavin <clavin@electronjs.org>

* Fix ElectronCornerSmoothing::CSSValueFromComputedStyleInternal

Co-authored-by: clavin <clavin@electronjs.org>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: clavin <clavin@electronjs.org>

docs/api/corner-smoothing-css.md

@@ -51,19 +51,17 @@ Use the `system-ui` keyword to match the smoothness to the OS design language.
 
 ### Controlling availibility
 
-This CSS rule can be disabled by setting [the `cornerSmoothingCSS` web preference](./structures/web-preferences.md) to `false`.
+This CSS rule can be disabled using the Blink feature flag `ElectronCSSCornerSmoothing`.
 
 ```js
 const myWindow = new BrowserWindow({
   // [...]
   webPreferences: {
-    enableCornerSmoothingCSS: false // Disables the `-electron-corner-smoothing` CSS rule
+    disableBlinkFeatures: 'ElectronCSSCornerSmoothing' // Disables the `-electron-corner-smoothing` CSS rule
   }
 })
 ```
 
-The CSS rule will still parse, but will have no visual effect.
-
 ### Formal reference
 
 * **Initial value**: `0%`

docs/api/structures/web-preferences.md

@@ -149,7 +149,6 @@
   `WebContents` when the preferred size changes. Default is `false`.
 * `transparent` boolean (optional) - Whether to enable background transparency for the guest page. Default is `true`. **Note:** The guest page's text and background colors are derived from the [color scheme](https://developer.mozilla.org/en-US/docs/Web/CSS/color-scheme) of its root element. When transparency is enabled, the text color will still change accordingly but the background will remain transparent.
 * `enableDeprecatedPaste` boolean (optional) _Deprecated_ - Whether to enable the `paste` [execCommand](https://developer.mozilla.org/en-US/docs/Web/API/Document/execCommand). Default is `false`.
-* `enableCornerSmoothingCSS` boolean (optional) _Experimental_ - Whether the [`-electron-corner-smoothing` CSS rule](../corner-smoothing-css.md) is enabled. Default is `true`.
 
 [chrome-content-scripts]: https://developer.chrome.com/extensions/content_scripts#execution-environment
 [runtime-enabled-features]: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/runtime_enabled_features.json5

patches/chromium/feat_corner_smoothing_css_rule_and_blink_painting.patch

@@ -16,64 +16,9 @@ making three primary changes to Blink:
     * Modifies graphics to handle smooth `ContouredRect`s, delegating to
       `//electron/shell/renderer/electron_smooth_round_rect`.
 
-3. Adds a renderer preference / web setting:
+3. Adds a renderer feature:
     * Controls whether the CSS rule is available.
-    * Mostly simple "plumbing" for the setting through blink.
 
-diff --git a/third_party/blink/common/renderer_preferences/renderer_preferences_mojom_traits.cc b/third_party/blink/common/renderer_preferences/renderer_preferences_mojom_traits.cc
-index c13dfd7f20e6f281f51ae373ceebeb86104c5cd9..fac89df9f23f3f098096d2a07a07e623b1067270 100644
---- a/third_party/blink/common/renderer_preferences/renderer_preferences_mojom_traits.cc
-+++ b/third_party/blink/common/renderer_preferences/renderer_preferences_mojom_traits.cc
-@@ -128,6 +128,8 @@ bool StructTraits<blink::mojom::RendererPreferencesDataView,
-     return false;
-   }
- 
-+  out->electron_corner_smoothing_css = data.electron_corner_smoothing_css();
-+
-   out->canvas_noise_token = data.canvas_noise_token();
- 
-   out->view_source_line_wrap_enabled = data.view_source_line_wrap_enabled();
-diff --git a/third_party/blink/public/common/renderer_preferences/renderer_preferences.h b/third_party/blink/public/common/renderer_preferences/renderer_preferences.h
-index 75acd696a5258e52f5c17b88559dfb3f6373c669..34b5ed725702dca72c383c1def08fdb835f7fa6b 100644
---- a/third_party/blink/public/common/renderer_preferences/renderer_preferences.h
-+++ b/third_party/blink/public/common/renderer_preferences/renderer_preferences.h
-@@ -91,6 +91,7 @@ struct BLINK_COMMON_EXPORT RendererPreferences {
-   bool caret_browsing_enabled{false};
-   bool uses_platform_autofill{false};
-   std::vector<uint16_t> explicitly_allowed_network_ports;
-+  bool electron_corner_smoothing_css{true};
-   uint64_t canvas_noise_token{0};
-   // The default value must be false to avoid performance problems on very large
-   // source pages.
-diff --git a/third_party/blink/public/common/renderer_preferences/renderer_preferences_mojom_traits.h b/third_party/blink/public/common/renderer_preferences/renderer_preferences_mojom_traits.h
-index defe40d7091cb4ba4b099a22aeaee71f78ff5e77..e8326fa7a3c45c08c7d9250edd52a6d73fcc3ff9 100644
---- a/third_party/blink/public/common/renderer_preferences/renderer_preferences_mojom_traits.h
-+++ b/third_party/blink/public/common/renderer_preferences/renderer_preferences_mojom_traits.h
-@@ -275,6 +275,11 @@ struct BLINK_COMMON_EXPORT
-     return data.explicitly_allowed_network_ports;
-   }
- 
-+  static const bool& electron_corner_smoothing_css(
-+      const ::blink::RendererPreferences& data) {
-+    return data.electron_corner_smoothing_css;
-+  }
-+
-   static const uint64_t& canvas_noise_token(
-       const ::blink::RendererPreferences& data) {
-     return data.canvas_noise_token;
-diff --git a/third_party/blink/public/mojom/renderer_preferences.mojom b/third_party/blink/public/mojom/renderer_preferences.mojom
-index f8361faf6151210d65a597562c533aaa0a5235df..328238c34a9381fbbeb5970af3de721c8412104e 100644
---- a/third_party/blink/public/mojom/renderer_preferences.mojom
-+++ b/third_party/blink/public/mojom/renderer_preferences.mojom
-@@ -202,6 +202,8 @@ struct RendererPreferences {
- 
-   array<uint16> explicitly_allowed_network_ports;
- 
-+  bool electron_corner_smoothing_css;
-+
-   // A randomized 64 bit token that is generated per browser session,
-   // used for canvas noising.
-   uint64 canvas_noise_token = 0;
 diff --git a/third_party/blink/public/mojom/use_counter/metrics/css_property_id.mojom b/third_party/blink/public/mojom/use_counter/metrics/css_property_id.mojom
 index e8c017c725f9d9b4f9099c824dfdb4c2cb9cbea6..73e135476bc4c930fd011745503e7f095ccfd8ec 100644
 --- a/third_party/blink/public/mojom/use_counter/metrics/css_property_id.mojom
@@ -86,18 +31,6 @@ index e8c017c725f9d9b4f9099c824dfdb4c2cb9cbea6..73e135476bc4c930fd011745503e7f09
  
      // This CSSSampleId represents page load for CSS histograms. It is recorded once
      // per page visit for each CSS histogram being logged on the blink side and the
-diff --git a/third_party/blink/public/web/web_settings.h b/third_party/blink/public/web/web_settings.h
-index 7fdc9866c9db5838ac8852ba156f2f04eb238bf5..56551d8190b3672d7c00c9bc722cf7e3aed255a6 100644
---- a/third_party/blink/public/web/web_settings.h
-+++ b/third_party/blink/public/web/web_settings.h
-@@ -285,6 +285,7 @@ class WebSettings {
-   virtual void SetRequireTransientActivationAndAuthorizationForSubAppsAPIs(
-       bool) = 0;
-   virtual void SetRootScrollbarThemeColor(std::optional<SkColor>) = 0;
-+  virtual void SetCornerSmoothingCSS(bool) = 0;
- 
-  protected:
-   ~WebSettings() = default;
 diff --git a/third_party/blink/renderer/build/scripts/core/css/css_properties.py b/third_party/blink/renderer/build/scripts/core/css/css_properties.py
 index e189d584f05f2ce6354c03a9b19f56985df8a15e..41b430e8f2416be098494f5c49fb97cae13447aa 100755
 --- a/third_party/blink/renderer/build/scripts/core/css/css_properties.py
@@ -112,16 +45,17 @@ index e189d584f05f2ce6354c03a9b19f56985df8a15e..41b430e8f2416be098494f5c49fb97ca
                      'internal-forced-visited-'):
                  internal_visited_order = 0
 diff --git a/third_party/blink/renderer/core/css/css_properties.json5 b/third_party/blink/renderer/core/css/css_properties.json5
-index 9ef592d0d86e4a6296db98b9c31f008f877dd348..45b5462631a762c90c756298f8f252bccf200389 100644
+index 9ef592d0d86e4a6296db98b9c31f008f877dd348..b16bc9b41f6b3a596a0e52a516b7182c54c66b1e 100644
 --- a/third_party/blink/renderer/core/css/css_properties.json5
 +++ b/third_party/blink/renderer/core/css/css_properties.json5
-@@ -9002,6 +9002,24 @@
+@@ -9002,6 +9002,26 @@
        property_methods: ["ParseShorthand", "CSSValueFromComputedStyleInternal"],
      },
  
 +    {
 +      name: "-electron-corner-smoothing",
-+      property_methods: ["ParseSingleValue"],
++      property_methods: ["ParseSingleValue", "CSSValueFromComputedStyleInternal"],
++      interpolable: true,
 +      field_group: "*",
 +      field_template: "external",
 +      // To keep this patch small, Length is used instead of a more descriptive
@@ -129,12 +63,13 @@ index 9ef592d0d86e4a6296db98b9c31f008f877dd348..45b5462631a762c90c756298f8f252bc
 +      // - `system-ui` = `Length::Auto()`
 +      // - percent     = `Length::Percent`
 +      type_name: "Length",
-+      converter: "ConvertCornerSmoothing",
-+      keywords: ["system-ui"],
 +      default_value: "Length::None()",
-+      typedom_types: ["Keyword", "Percentage"],
++      keywords: ["system-ui"],
-+      is_border_radius: true,
++      converter: "ConvertCornerSmoothing",
-+      invalidate: ["paint", "border-radius", "clip"],
++      runtime_flag: "ElectronCSSCornerSmoothing",
++      valid_for_permission_element: true,
++      valid_for_page_context: true,
++      invalidate: ["border-radius", "paint", "corner-shape"],
 +    },
 +
      // Visited properties.
@@ -154,10 +89,10 @@ index 4f13354776da9944ed75874953a2e2c9878a649b..83728e697c5029a79fb75d84a1be5bdf
        return a.EmptyCells() == b.EmptyCells();
      case CSSPropertyID::kFill:
 diff --git a/third_party/blink/renderer/core/css/properties/longhands/longhands_custom.cc b/third_party/blink/renderer/core/css/properties/longhands/longhands_custom.cc
-index dc328e04767437d2d9b6d67d07cb6c9d055773f9..01dde66dbbff0c1bf1e1a52486f1901328b4217b 100644
+index dc328e04767437d2d9b6d67d07cb6c9d055773f9..19edb190c57b75e29e71d6342e3a648ef4611fdf 100644
 --- a/third_party/blink/renderer/core/css/properties/longhands/longhands_custom.cc
 +++ b/third_party/blink/renderer/core/css/properties/longhands/longhands_custom.cc
-@@ -12325,5 +12325,25 @@ const CSSValue* InternalEmptyLineHeight::ParseSingleValue(
+@@ -12325,5 +12325,36 @@ const CSSValue* InternalEmptyLineHeight::ParseSingleValue(
                                           CSSValueID::kNone>(stream);
  }
  
@@ -165,12 +100,6 @@ index dc328e04767437d2d9b6d67d07cb6c9d055773f9..01dde66dbbff0c1bf1e1a52486f19013
 +    CSSParserTokenStream& stream,
 +    const CSSParserContext& context,
 +    const CSSParserLocalContext&) const {
-+  // Fail parsing if this rule is disabled by document settings.
-+  if (Settings* settings = context.GetDocument()->GetSettings();
-+      settings && !settings->GetElectronCornerSmoothingCSS()) {
-+    return nullptr;
-+  }
-+
 +  // Try to parse `system-ui` keyword first.
 +  if (auto* ident =
 +          css_parsing_utils::ConsumeIdent<CSSValueID::kSystemUi>(stream)) {
@@ -180,6 +109,23 @@ index dc328e04767437d2d9b6d67d07cb6c9d055773f9..01dde66dbbff0c1bf1e1a52486f19013
 +  return css_parsing_utils::ConsumePercent(
 +      stream, context, CSSPrimitiveValue::ValueRange::kNonNegative);
 +}
++
++const CSSValue* ElectronCornerSmoothing::CSSValueFromComputedStyleInternal(
++    const ComputedStyle& style,
++    const LayoutObject*,
++    bool allow_visited_style,
++    CSSValuePhase value_phase) const {
++  const Length& length = style.ElectronCornerSmoothing();
++  switch (length.GetType()) {
++    case Length::kAuto:
++      return CSSIdentifierValue::Create(CSSValueID::kSystemUi);
++    case Length::kPercent:
++      return CSSNumericLiteralValue::Create(
++          length.Percent(), CSSPrimitiveValue::UnitType::kPercentage);
++    default:
++      return CSSIdentifierValue::Create(CSSValueID::kNone);
++  }
++}
 +
  }  // namespace css_longhand
  }  // namespace blink
@@ -215,60 +161,6 @@ index d1430dc2dc30a1962731492c3f53849c7ff8a4db..417ac19f5968b7300ec2f0422728cd85
    static FitText ConvertFitText(StyleResolverState&, const CSSValue&);
  
    static ScopedCSSNameList* ConvertTimelineTriggerName(StyleResolverState&,
-diff --git a/third_party/blink/renderer/core/exported/web_settings_impl.cc b/third_party/blink/renderer/core/exported/web_settings_impl.cc
-index 5a291913e020a785d0e9a1d07dd3bc88d223cc62..f01b25c7af9111596c53dadc5c08c4f1c031fc86 100644
---- a/third_party/blink/renderer/core/exported/web_settings_impl.cc
-+++ b/third_party/blink/renderer/core/exported/web_settings_impl.cc
-@@ -817,4 +817,8 @@ void WebSettingsImpl::SetRootScrollbarThemeColor(
-   settings_->SetRootScrollbarThemeColor(theme_color);
- }
- 
-+void WebSettingsImpl::SetCornerSmoothingCSS(bool available) {
-+  settings_->SetElectronCornerSmoothingCSS(available);
-+}
-+
- }  // namespace blink
-diff --git a/third_party/blink/renderer/core/exported/web_settings_impl.h b/third_party/blink/renderer/core/exported/web_settings_impl.h
-index a9fa6e94716bd5e53bc550d0a8d5e200bf0242af..b8d9d99edc8310eda762c83a6a95a43246792b20 100644
---- a/third_party/blink/renderer/core/exported/web_settings_impl.h
-+++ b/third_party/blink/renderer/core/exported/web_settings_impl.h
-@@ -237,6 +237,7 @@ class CORE_EXPORT WebSettingsImpl final : public WebSettings {
-   void SetRequireTransientActivationAndAuthorizationForSubAppsAPIs(
-       bool) override;
-   void SetRootScrollbarThemeColor(std::optional<SkColor>) override;
-+  void SetCornerSmoothingCSS(bool) override;
- 
-   bool RenderVSyncNotificationEnabled() const {
-     return render_v_sync_notification_enabled_;
-diff --git a/third_party/blink/renderer/core/exported/web_view_impl.cc b/third_party/blink/renderer/core/exported/web_view_impl.cc
-index bb9745b97e411c03c4757f7a96e240df93b28559..015dae15ada4ff373d0077c4078ffacf1ba9dc63 100644
---- a/third_party/blink/renderer/core/exported/web_view_impl.cc
-+++ b/third_party/blink/renderer/core/exported/web_view_impl.cc
-@@ -3594,6 +3594,9 @@ void WebViewImpl::UpdateRendererPreferences(
-       renderer_preferences_.view_source_line_wrap_enabled);
- 
-   MaybePreloadSystemFonts(GetPage());
-+
-+  GetSettings()->SetCornerSmoothingCSS(
-+      renderer_preferences_.electron_corner_smoothing_css);
- }
- 
- void WebViewImpl::SetHistoryIndexAndLength(int32_t history_index,
-diff --git a/third_party/blink/renderer/core/frame/settings.json5 b/third_party/blink/renderer/core/frame/settings.json5
-index 9f68384d71136da79de5fbf7e3feac2a13b7dbec..2bd6f597974c9bdf05b743c8c00182432c8e8dba 100644
---- a/third_party/blink/renderer/core/frame/settings.json5
-+++ b/third_party/blink/renderer/core/frame/settings.json5
-@@ -1261,5 +1261,10 @@
-       initial: false,
-       type: "bool"
-     },
-+    {
-+      name: "electronCornerSmoothingCSS",
-+      initial: true,
-+      invalidate: ["Style"],
-+    },
-   ],
- }
 diff --git a/third_party/blink/renderer/core/paint/contoured_border_geometry.cc b/third_party/blink/renderer/core/paint/contoured_border_geometry.cc
 index ec80337fdac36fa1636f5142c3827d3bbc81644c..634db12dfb443acabde79e9faf59cb8415991464 100644
 --- a/third_party/blink/renderer/core/paint/contoured_border_geometry.cc
@@ -375,7 +267,7 @@ index 59031b23d3c50aa87db48a5c5a66c5ab04a8103a..1f83cf0dff83d748bf1caafd3685202c
  
    // A Corner is a axis-aligned quad, with the points ordered (start, outer,
 diff --git a/third_party/blink/renderer/platform/geometry/path_builder.cc b/third_party/blink/renderer/platform/geometry/path_builder.cc
-index 4a77f944e9ad0b18f10f1a572673769453473fb9..ace138137f002d0866e5cc71b44bf5b4ac85bac1 100644
+index 4a77f944e9ad0b18f10f1a572673769453473fb9..73a3fac1be9a8c29d1b3391bf05eef13df9415d9 100644
 --- a/third_party/blink/renderer/platform/geometry/path_builder.cc
 +++ b/third_party/blink/renderer/platform/geometry/path_builder.cc
 @@ -4,6 +4,7 @@
@@ -386,7 +278,7 @@ index 4a77f944e9ad0b18f10f1a572673769453473fb9..ace138137f002d0866e5cc71b44bf5b4
  #include "third_party/blink/renderer/platform/geometry/contoured_rect.h"
  #include "third_party/blink/renderer/platform/geometry/infinite_int_rect.h"
  #include "third_party/blink/renderer/platform/geometry/path.h"
-@@ -248,6 +249,26 @@ PathBuilder& PathBuilder::AddContouredRect(
+@@ -248,6 +249,32 @@ PathBuilder& PathBuilder::AddContouredRect(
      AddRoundedRect(target_rect);
      return *this;
    }
@@ -402,10 +294,16 @@ index 4a77f944e9ad0b18f10f1a572673769453473fb9..ace138137f002d0866e5cc71b44bf5b4
 +    float smoothness = std::clamp(
 +        contoured_rect.GetCornerCurvature().Smoothness(), 0.0f, 1.0f);
 +
++    // Since the Electron implementation of DrawSmoothRoundRect uses one radius
++    // for both dimensions, we need to use the minimum of the two supplied.
++    auto min_radius = [](const gfx::SizeF& radius) -> float {
++      return std::min(radius.width(), radius.height());
++    };
++
 +    builder_.addPath(electron::DrawSmoothRoundRect(
 +        box.x(), box.y(), box.width(), box.height(), smoothness,
-+        radii.TopLeft().width(), radii.TopRight().width(),
++        min_radius(radii.TopLeft()), min_radius(radii.TopRight()),
-+        radii.BottomRight().width(), radii.BottomLeft().width()));
++        min_radius(radii.BottomRight()), min_radius(radii.BottomLeft())));
 +
 +    return *this;
 +  }
@@ -413,3 +311,18 @@ index 4a77f944e9ad0b18f10f1a572673769453473fb9..ace138137f002d0866e5cc71b44bf5b4
    const FloatRoundedRect& origin_rect = contoured_rect.GetOriginRect();
  
    auto DrawAsSinglePath = [&]() {
+diff --git a/third_party/blink/renderer/platform/runtime_enabled_features.json5 b/third_party/blink/renderer/platform/runtime_enabled_features.json5
+index 382c9749aaaf2827b76c0a63df96e45a7c88b62b..88c2310c5cccfab7e5a3cdad54657bae185655dd 100644
+--- a/third_party/blink/renderer/platform/runtime_enabled_features.json5
++++ b/third_party/blink/renderer/platform/runtime_enabled_features.json5
+@@ -214,6 +214,10 @@
+   },
+ 
+   data: [
++    {
++      name: "ElectronCSSCornerSmoothing",
++      status: "stable",
++    },
+     {
+       name: "Accelerated2dCanvas",
+       settable_from_internals: true,

shell/browser/web_contents_preferences.cc

@@ -149,7 +149,6 @@ void WebContentsPreferences::Clear() {
   preload_path_ = std::nullopt;
   v8_cache_options_ = blink::mojom::V8CacheOptions::kDefault;
   deprecated_paste_enabled_ = false;
-  corner_smoothing_css_ = true;
 
 #if BUILDFLAG(IS_MAC)
   scroll_bounce_ = false;
@@ -229,8 +228,6 @@ void WebContentsPreferences::SetFromDictionary(
   if (web_preferences.Get(options::kDisableBlinkFeatures,
                           &disable_blink_features))
     disable_blink_features_ = disable_blink_features;
-  web_preferences.Get(options::kEnableCornerSmoothingCSS,
-                      &corner_smoothing_css_);
 
   base::FilePath::StringType preload_path;
   if (web_preferences.Get(options::kPreloadScript, &preload_path)) {
@@ -481,8 +478,6 @@ void WebContentsPreferences::OverrideWebkitPrefs(
   prefs->v8_cache_options = v8_cache_options_;
 
   prefs->dom_paste_enabled = deprecated_paste_enabled_;
-
-  renderer_prefs->electron_corner_smoothing_css = corner_smoothing_css_;
 }
 
 WEB_CONTENTS_USER_DATA_KEY_IMPL(WebContentsPreferences);

shell/browser/web_contents_preferences.h

@@ -134,7 +134,6 @@ class WebContentsPreferences
   std::optional<base::FilePath> preload_path_;
   blink::mojom::V8CacheOptions v8_cache_options_;
   bool deprecated_paste_enabled_ = false;
-  bool corner_smoothing_css_;
 
 #if BUILDFLAG(IS_MAC)
   bool scroll_bounce_;

shell/common/options_switches.h

@@ -219,9 +219,6 @@ inline constexpr std::string_view kSpellcheck = "spellcheck";
 inline constexpr std::string_view kEnableDeprecatedPaste =
     "enableDeprecatedPaste";
 
-// Whether the -electron-corner-smoothing CSS rule is enabled.
-inline constexpr std::string_view kEnableCornerSmoothingCSS =
-    "enableCornerSmoothingCSS";
 }  // namespace options
 
 // Following are actually command line switches, should be moved to other files.

shell/renderer/electron_smooth_round_rect.cc

@@ -6,6 +6,7 @@
 
 #include <numbers>
 #include "base/check.h"
+#include "base/check_op.h"
 
 namespace electron {
 
@@ -263,13 +264,14 @@ SkPath DrawSmoothRoundRect(float x,
                            float top_right_radius,
                            float bottom_right_radius,
                            float bottom_left_radius) {
-  DCHECK(0.0f <= smoothness && smoothness <= 1.0f);
+  DCHECK_GE(smoothness, 0.0f);
+  DCHECK_LE(smoothness, 1.0f);
 
   // Assume the radii are already constrained within the rectangle size
-  DCHECK(top_left_radius + top_right_radius <= width);
+  DCHECK_LE(top_left_radius + top_right_radius, width);
-  DCHECK(bottom_left_radius + bottom_right_radius <= width);
+  DCHECK_LE(bottom_left_radius + bottom_right_radius, width);
-  DCHECK(top_left_radius + bottom_left_radius <= height);
+  DCHECK_LE(top_left_radius + bottom_left_radius, height);
-  DCHECK(top_right_radius + bottom_right_radius <= height);
+  DCHECK_LE(top_right_radius + bottom_right_radius, height);
 
   if (width <= 0.0f || height <= 0.0f) {
     return SkPath();

spec/api-corner-smoothing-spec.ts

@@ -85,7 +85,7 @@ async function pageCaptureTestRecipe (
     height: 600,
     useContentSize: true,
     webPreferences: {
-      enableCornerSmoothingCSS: cornerSmoothingAvailable
+      disableBlinkFeatures: cornerSmoothingAvailable ? undefined : 'ElectronCSSCornerSmoothing'
     }
   });
   await w.loadFile(pagePath);