A computing device comprising: at least one processor; and memory having computer-executable instructions stored thereon that, based on execution by the at least one processor, configure the computing device to detect display abnormalities within a multi-feature document, each feature representing a portion of the visible content in a document, as it would be rendered by a user's client application in accordance with presentation instructions in said document through image analysis by being configured to: for each of a plurality of documents that include a particular feature, generate an image that depicts the particular feature within a document thereby forming a plurality of images; calculate a normal range for a visible characteristic of the particular feature by measuring the visible characteristic for each of the plurality of images through an image analysis of the image; wherein the visible characteristic is a size of a largest rectangle within the images comprising only pixels of a background color of the particular feature or a percentage of pixels within the images that matches a background color of the particular feature; identify an area of a specific document that displays the particular feature; generate a specific image of the particular feature within the specific document; calculate a score for the visible characteristic of the specific image by measuring the visible characteristic through analysis of the specific image; determine that a visible abnormality is present within the specific image by determining that the score is outside of a normal range for the particular feature; and generate an error notification that the visible abnormality is present within the specific document for fixing said visible abnormality by a person associated with the document. at least one processor; and memory having computer-executable instructions stored thereon that, based on execution by the at least one processor, configure the computing device to detect display abnormalities within a multi-feature document, each feature representing a portion of the visible content in a document, as it would be rendered by a user's client application in accordance with presentation instructions in said document through image analysis by being configured to: for each of a plurality of documents that include a particular feature, generate an image that depicts the particular feature within a document thereby forming a plurality of images; calculate a normal range for a visible characteristic of the particular feature by measuring the visible characteristic for each of the plurality of images through an image analysis of the image; wherein the visible characteristic is a size of a largest rectangle within the images comprising only pixels of a background color of the particular feature or a percentage of pixels within the images that matches a background color of the particular feature; identify an area of a specific document that displays the particular feature; generate a specific image of the particular feature within the specific document; calculate a score for the visible characteristic of the specific image by measuring the visible characteristic through analysis of the specific image; determine that a visible abnormality is present within the specific image by determining that the score is outside of a normal range for the particular feature; and generate an error notification that the visible abnormality is present within the specific document for fixing said visible abnormality by a person associated with the document. for each of a plurality of documents that include a particular feature, generate an image that depicts the particular feature within a document thereby forming a plurality of images; calculate a normal range for a visible characteristic of the particular feature by measuring the visible characteristic for each of the plurality of images through an image analysis of the image; wherein the visible characteristic is a size of a largest rectangle within the images comprising only pixels of a background color of the particular feature or a percentage of pixels within the images that matches a background color of the particular feature; identify an area of a specific document that displays the particular feature; generate a specific image of the particular feature within the specific document; calculate a score for the visible characteristic of the specific image by measuring the visible characteristic through analysis of the specific image; determine that a visible abnormality is present within the specific image by determining that the score is outside of a normal range for the particular feature; and generate an error notification that the visible abnormality is present within the specific document for fixing said visible abnormality by a person associated with the document.