ASP.Net message: Attribute autocomplete is not a valid attribute of element TextBox

Hi alhakimyyes,

Don't worry about that warning message. This happens because of the ASP.Net version support for HTML. As .Net framework 4.5 introduced many new features supporting HTML5 and for all those unsupported attributes it would display the same unsupported warning.

Or the only way to remove the Messages is by adding the attribute on page load using JavaScript.