Editing Help:Gallery (section)

==Optional gallery attributes==
The gallery tag itself takes several additional parameters, specified as attribute name-value pairs:

<pre>
<gallery {parameters}>
{images}
</gallery>
</pre>

* <code>caption="{caption}"</code>: (caption text between double quotes for more than a word) sets a caption centered atop the gallery. Only plain text may be used in the caption; formatting, templates and the like will not work.
* <code>widths={width}px</code>: sets the (max) widths of the images; the default value is 120px. ''Note the plural: width'''s'''''.
* <code>heights={heights}px</code>: sets the (max) heights of the images; the default value is 120px.
* <code>perrow={integer}</code>: sets the number of images per row. 0 means automatically adjust based on width of screen.
* <code>showfilename={anything}</code>: Show the filenames of the images in the individual captions for each image (1.17+).
* <code>mode={traditional|nolines|packed|packed-hover|packed-overlay|slideshow}</code>: See section above (1.22+; 1.28+ for "slideshow").
* <code>showthumbnails</code>: For "slideshow" mode only, display the strip with image thumbnails below the slideshow by default (1.29+).