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It would be very useful to be able to validate the HTML and tags in JSP's (like the Validate XML feature) and then preview them in a browser. The lack of this feature makes JSP development much more time consuming and error prone. Are there any plans for this?
Preview in browser is implemented - see actions HTML-View and JSP-Run. JSP can be validated by compiling (F9). I don't fully understand Validation part. Do you mean adding support for HTML Validator?
*** This issue has been marked as a duplicate of 11254 ***