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The compatibility mode for attributes in Internet Explorer is only required should the user need to use innerHTML or outerHTML to get hold of the markup for a form. Using either name properties or setAttribute results in the name attributes being present in the document but not available to innerHTML or outerHTML. When disabled DOMTool uses setAttribute to generate name attributes
Warnings are shown when a user uses attributes that are not considered best practice. However for development one might take a “quick and dirty” approach for speed with a view to replacing that code after functionality has been proven. For that reason it is possible to disable the warnings.