Classifying input fields and groups of input fields of a webpage

An apparatus comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the apparatus to:
• identify content of a webpage, the webpage comprising input fields and groups of input fields, the webpage comprising one or more HTML-encoded documents, the instructions to identify comprising instructions to:
• generate, for each HTML-encoded document of the one or more HTML-encoded documents, a document identifier of the HTML-encoded document;
• for each HTML-encoded document having one or more in-line frames, generate, for each in-line frame of the one or more in-line frames, a frame identifier and a parent identifier, wherein the parent identifier identifies the HTML-encoded document having the respective in-line frame;
• determine, for each HTML-encoded document, whether one or more invisible elements exist;
• determine, for each HTML-encoded document, whether one or more visible elements exist;
• group the visible elements to create a report file, the report file comprising a hierarchical structure associated with the one or more visible elements or the one or more invisible elements or a combination of the one or more visible elements and the one or more invisible elements, wherein the hierarchical structure comprises, for each in-line frame, an in-line frame hierarchical structure;
• and
• output the report file;
• determine, based on the report file, a single tree data structure comprising a single tree of elements for each HTML-encoded document of the webpage;
• and
• output the single tree data structure.