Section containing iFrame is not rendereding correctly
Section containing iFrame is not rendering as blank.
Steps to Reproduce
1. Configure a section with iFrame.
2. Run the use-case and observe that blank screen is appearing in the UI.
New single document dynamic containers are created with iFrame mode disabled by default.
Legacy iFrame mode is still available,but must be enabled by clicking the Use Legacy iFrame mode check-box.
Enable “Use legacy iFrame mode(not recommended)” option in layout properties of the dynamic container.
Selecting this option renders the portal with iframes.
These kind of portals are not supported for mobile and this is the main impact or reason, why it is not recommended as mentioned in the bracket near the option If you want your portal to render in mobiles, then they should not use this option, iFrame will render but with may face some issues.
Refer this link for details :