Related to #19965
See discussion there concerning B\C breaks in Joomla 3.x.
Summary of Changes
Adds a new switch Legacy (HTML4) versus HTML5.
Legacy is the default setting. Thus, this pr will not break older template overrides that use HTML4 attributes for IFRAME tags that have been removed in HTML5.
HTML5 uses CSS style instead.
Doesn't touch old parameter types and names but translates them via PHP for HTML5 mode if necessary.
Comment: Because most current browsers don't support CSS rule overflow for displaying/hiding scroll bars for IFRAME tags scrolling attribute cannot be removed in HTML5 mode.
Testing Instructions
Testing Instructions
Apply patch.
Create a module of type "Wrapper" with setting Mode = Legacy.
Create another module of type "Wrapper" with setting Mode = HTML5.
Compare outputs in frontend.
Test also other settings and compare output in frontend.
joomla-cms-bot
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