8. A system comprising: at least one memory storing computer-executable instructions; and at least one processor configured to access the at least one memory and execute the computer-executable instructions to: access markup language data comprising markup language elements; process the markup language data, with a headless browser without display in a graphical user interface, to generate a document object model (“DOM”) tree; based at least in part on the DOM tree, generate a DOM vector array comprising entries in a single-hierarchical data structure, wherein the entries are representative of presentation of the markup language elements; access two or more layout rules comprising a first layout rule and a second layout rule, wherein the first layout rule comprises a tolerance specifying that two or more elements overlaying one another during presentation constitutes a layout error, wherein the tolerance is represented by a number of pixels, wherein the second layout rule comprises a maximum number of markup language layers permitted; determine a first application of the first layout rule to the DOM vector array; determine a second application of the second layout rule to the DOM vector array; determine that a layout error is not present in the second application; determine that a layout error is present in the first application, wherein the layout error is represented by a first amount of pixels; determine a second amount of pixels by which the layout error exceeds the tolerance of one or more conditions of the first layout rule; generate verification results based at least in part on the second amount of pixels; and generate one or more corrective relocation recommendations including a third amount of pixels by which to displace one or more markup language elements to satisfy the first layout rule, wherein the third amount of pixels is based at least in part on the second amount of pixels.
8. A system comprising: at least one memory storing computer-executable instructions; and at least one processor configured to access the at least one memory and execute the computer-executable instructions to: access markup language data comprising markup language elements; process the markup language data, with a headless browser without display in a graphical user interface, to generate a document object model (“DOM”) tree; based at least in part on the DOM tree, generate a DOM vector array comprising entries in a single-hierarchical data structure, wherein the entries are representative of presentation of the markup language elements; access two or more layout rules comprising a first layout rule and a second layout rule, wherein the first layout rule comprises a tolerance specifying that two or more elements overlaying one another during presentation constitutes a layout error, wherein the tolerance is represented by a number of pixels, wherein the second layout rule comprises a maximum number of markup language layers permitted; determine a first application of the first layout rule to the DOM vector array; determine a second application of the second layout rule to the DOM vector array; determine that a layout error is not present in the second application; determine that a layout error is present in the first application, wherein the layout error is represented by a first amount of pixels; determine a second amount of pixels by which the layout error exceeds the tolerance of one or more conditions of the first layout rule; generate verification results based at least in part on the second amount of pixels; and generate one or more corrective relocation recommendations including a third amount of pixels by which to displace one or more markup language elements to satisfy the first layout rule, wherein the third amount of pixels is based at least in part on the second amount of pixels. 11. The system of claim 8 , the two or more layout rules further comprising one or more of: a presentation size specifying maximum horizontal and vertical number of pixels available during presentation of data or an element placement parameter specifying where an element is permitted or disallowed during presentation of data.