后台编辑器增加img几个属性

app/code/Magento/Backend/view/adminhtml/templates/widget/form/element.phtml

@@ -110,7 +110,7 @@ $htmlId = $element->getHtmlId();
                 theme_advanced_toolbar_align : "left",
                 theme_advanced_path_location : "bottom",
                 extended_valid_elements : "a[name|href|target|title|onclick],img[class|src|border=0|alt|title|hspace"
-                    + "|vspace|width|height|align|onmouseover|onmouseout|name],hr[class|width|size"
+                    + "|vspace|width|height|align|onmouseover|onmouseout|name|loading|srcset|sizes],hr[class|width|size"
                     + "|noshade],font[face|size|color|style],span[class|align|style]",
                 theme_advanced_resize_horizontal : 'false',
                 theme_advanced_resizing : 'true',