The idea behind placeholders. Placeholder does not work in browsers that do not support HTML5 and hence please refer these link. Display WaterMark text for Password TextBox in ASP.Net . I cannot figure out what is wrong with my markup, but the placeholder for the text area will not appear. required: Requires that the textarea contain content prior to allowing form submission. How to solve it? What I have to change to implement same TextArea in my Asp.Net WebPage . /* Selects any element with an active placeholder */:placeholder-shown {border: 2px solid silver;} 2020-12-01 forms html jquery placeholder textarea. Other than the above, but not suitable for the Qiita community (violation of guidelines)