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To enforce a break so picture stays with block

<br clear="all">

To embed an acrobat pdf file for slide series

<embed_document width="55%" height="400">http://depts.washington.edu/cmditr/media/OLED2_ecl_redoxpairs.pdf</embed_document>

To make a heading that autmatically gets assembled as table of contents when there are more than 3 such headings.

===Heading===

TO have a gallery of images with individual captions

<gallery widths=300px heights=200px perrow=3> Image:Oled1_3_eclredox.png‎|First the loss of an electron by this conjugated aromatic system to form a cation radical species. Image:Oled1_4_eclredox.png‎‎| </gallery>

<math>\eta _\mathrm{ext} = \eta_\mathrm{ph} \eta_\mathrm{int} = \eta_\mathrm{ph} \gamma \phi \eta_\mathrm{ext}\,\!</math>

To put mid size picture in the scene

[[Image:OLED5-organic_heterojunction.jpg |thumb||400px | Organic Heterojunction]]

Flash in page <swf width="50" height="50">https://multimediaart.at/mmawiki/images/b/bb/Mini.swf</swf>