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Preserve the original image size, and put a box around the image. Show any caption below the image. Float the image on the right unless overridden with the location attribute. Note: Any size options specified will be ignored and flagged as a 'bogus file option' by the Linter. frameless Automatically scale the image up or down.
The available values for thumbnail size in Preferences (on the Appearance tab) are 120px, 150px, 180px, 200px, 220px (default), 250px, 300px, and 400px. As explained at Wikipedia:Extended image syntax § Size, upright=Factor will "adjust a thumbnail's size to Factor times the default thumbnail size, rounding the result to the nearest multiple of 10".
The default width and height are currently 120px. Images displayed by the <Gallery>...</Gallery> tag do not obey user viewing preferences. The packed mode will automatically adjust image sizes to use available display space optimally. Every line specifies an image file. The File: prefix is unnecessary.
Some users have small screens or need to configure their systems to display large text; "forced" large thumbnails can leave little width for text, making reading difficult. In addition, forcing a "larger" image size at say 260px will actually make it smaller for those with a larger size set as preference.
However, the table margins, border and font-size must be precisely set to match a typical image display. The Image-spec parameter "thumb|" (although auto-thumbnailing to user-preference width) forces a wide left-margin that squeezes the nearby text, so the parameter "center|" can be added to suppress the left-margin padding.
Media queries allow the page to use different CSS style rules based on characteristics of the device the site is being displayed on, e.g. width of the rendering surface (browser window width or physical display size). Responsive layouts automatically adjust and adapt to any device screen size, whether it is a desktop, a laptop, a tablet, or a ...
If your caption is longer than a few words, you may need to explicitly set the div width. Some browsers adjust the width of the div based on the width of the text, and if there is a large caption, the div may become too large. To solve this problem, simply set the width of the div to the width (in pixels) of the image, like so:
This brings up the gallery editor, with the full list of images included in the gallery. The gallery editor has two tabs, one to add images and their captions, the other controls display options. The order of images can be rearranged by dragging the images on the left, and can be added using the "Add new image" button at the bottom of the list.