Frame A should always have scrollbars:
The scrolling attribute is supported in Internet Explorer 8 and earlier versions, Firefox, and Opera.
Note: Internet Explorer 9 and newer versions, do not support the scrolling attribute.
The <frame> tag is not supported in HTML5.
The scrolling attribute specifies whether or not to display scrollbars in a <frame>.
By default, scrollbars appear in a <frame> if the content is larger than the <frame>.
|auto||Scrollbars appear if needed (this is default)|
|yes||Scrollbars are always shown (even if they are not needed)|
|no||Scrollbars are never shown (even if they are needed)|
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