Set default SVG image font settings

Source/core/svg/graphics/SVGImage.cpp

Index: Source/core/svg/graphics/SVGImage.cpp
diff --git a/Source/core/svg/graphics/SVGImage.cpp b/Source/core/svg/graphics/SVGImage.cpp
index 7091c0cc4998e97a9c4a3a633b0bddb4827d95db..edf144eb476899707ddb53f71ca610ab8bcbec71 100644
--- a/Source/core/svg/graphics/SVGImage.cpp
+++ b/Source/core/svg/graphics/SVGImage.cpp
@@ -427,6 +427,18 @@ bool SVGImage::dataChanged(bool allDataReceived)
             page->settings().setScriptEnabled(false);
             page->settings().setPluginsEnabled(false);
             page->settings().setAcceleratedCompositingEnabled(false);
+
+            // Because this page is detached, it can't get default font settings
+            // from the embedder. Copy over font settings so we have sensible
+            // defaults. These settings are fixed and will not update if changed.
+            if (!Page::ordinaryPages().isEmpty()) {
+                Settings& defaultSettings = (*Page::ordinaryPages().begin())->settings();
+                page->settings().genericFontFamilySettings() = defaultSettings.genericFontFamilySettings();
+                page->settings().setMinimumFontSize(defaultSettings.minimumFontSize());
+                page->settings().setMinimumLogicalFontSize(defaultSettings.minimumLogicalFontSize());
+                page->settings().setDefaultFontSize(defaultSettings.defaultFontSize());
+                page->settings().setDefaultFixedFontSize(defaultSettings.defaultFixedFontSize());
+            }
         }
 
         RefPtrWillBeRawPtr<LocalFrame> frame = nullptr;