diff --git a/addons/website/static/src/js/editor/snippets.options.js b/addons/website/static/src/js/editor/snippets.options.js
index b716fc2fb37..876ae78e3b6 100644
--- a/addons/website/static/src/js/editor/snippets.options.js
+++ b/addons/website/static/src/js/editor/snippets.options.js
@@ -284,7 +284,7 @@ const FontFamilyPickerUserValueWidget = SelectUserValueWidget.extend({
         }
 
         // Adapt font variable indexes to the removal
-        const style = window.getComputedStyle(document.documentElement);
+        const style = window.getComputedStyle(this.$target[0].ownerDocument.documentElement);
         _.each(FontFamilyPickerUserValueWidget.prototype.fontVariables, variable => {
             const value = weUtils.getCSSVariableValue(variable, style);
             if (value.substring(1, value.length - 1) === googleFontName) {
@@ -1474,7 +1474,7 @@ options.registry.ThemeColors = options.registry.OptionsTab.extend({
      */
     async start() {
         // Checks for support of the old color system
-        const style = window.getComputedStyle(document.documentElement);
+        const style = window.getComputedStyle(this.$target[0].ownerDocument.documentElement);
         const supportOldColorSystem = weUtils.getCSSVariableValue('support-13-0-color-system', style) === 'true';
         const hasCustomizedOldColorSystem = weUtils.getCSSVariableValue('has-customized-13-0-color-system', style) === 'true';
         this._showOldColorSystemWarning = supportOldColorSystem && hasCustomizedOldColorSystem;
diff --git a/addons/website/static/src/snippets/s_chart/options.js b/addons/website/static/src/snippets/s_chart/options.js
index 146a8b7e74b..711b94ad1f7 100644
--- a/addons/website/static/src/snippets/s_chart/options.js
+++ b/addons/website/static/src/snippets/s_chart/options.js
@@ -27,7 +27,7 @@ options.registry.InnerChart = options.Class.extend({
     init: function () {
         this._super.apply(this, arguments);
         this.themeArray = ['o-color-1', 'o-color-2', 'o-color-3', 'o-color-4', 'o-color-5'];
-        this.style = window.getComputedStyle(document.documentElement);
+        this.style = window.getComputedStyle(this.$target[0].ownerDocument.documentElement);
     },
     /**
      * @override