TYPO3 v7 has reached its end-of-life November 30th, 2018 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
There is no further ELTS support. It is recommended that you upgrade your project and use a supported version of TYPO3.
FRAME is an object type.
FRAME, FRAMESET and frameSet have been deprecated in version 8.5 of the TYPO3 core. Using this is no longer considered good practice.
Additionally, frameset and frame are no longer supported in HTML
See Deprecation: #78217 - frameset and frame (8.5 Changelog).
Configuration of frames and nested framesets.
border="0" framespacing="0" frameborder="NO"