Merge pull request #2167 from pjackson28/v3.0

Fixed the issue with vidoes in separate mobile view tabs (#1861)
Merge pull request #2171 from pjackson28/v3.0

Implemented workaround for #1699 that keeps the expanded accordion area in view
Merge pull request #2177 from pjackson28/v3.0

Fixed jumpiness in loading of details/summary polyfill (#2176)
Merge pull request #2180 from pjackson28/v3.0

Set all jQuery Mobile hidden popups to display: none to take them out of the tabbing order
Working examples: added clearing elements to stop layout float drop
Merge pull request #2191 from patheard/v3.0

Working examples: added clearing elements to stop layout float drop
Fixed list style type specificity issues (#2188).
Resolved merge conflicts.