| Help:Diff |
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For special cases (the diff for a single edit or between an old and the current version) other possibilities are clicking cur or last in the page history or on the Recent Changes page. The diff is also shown during an edit conflict so you can see exactly what you need to reintegrate.
Diff works also in preview, showing the difference between the currently stored version and the current version in the edit box
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Width
After the table of differences, the latest of the two compared versions is shown fully.
In the case of the Classic skin with quickbar, the diff page does not have the quickbar, to provide more space. Therefore the diff page is also useful for viewing the page on full screen width, without changing the preferences.
With the Monobook skin the panels on the left are also on the diff page.
Page widening is more likely on a diff page, because there are two columns, but also because URLs (especially long ones) are not hidden.
URL
To do a comparison with the older page rendered below the table of differences, provide the URL as follows.
Open the revision of one page that you wish to compare to another, for example http://meta.wikimedia.org/w/index.php?title=Help:Diff&oldid=78722, and the revision of the other page that you wish to compare, for example http://meta.wikimedia.org/w/index.php?title=Main_Page&oldid=98420. Copy the oldid number of one page (&oldid=78722 in the first example) and replace the text oldid with diff: &diff=78722. Paste this string into the URL of the other page between that page's title and its oldid (&oldid=98420 in the second example), so you have something like this:
http://meta.wikimedia.org/w/index.php?title=Main_Page&diff=78722&oldid=98420
You may remove the page title (title=Main_Page in the example above) from the URL if you wish, but this is not necessary. The resulting diff will compare the given versions of the two pages [1].
To compare the current version of the page and a given oldid, you can put "current" after "diff=" instead of an oldid. For example,
http://meta.wikimedia.org/w/index.php?title=Help:Diff&diff=current&oldid=124558
would compare the current version of this page with the version that has oldid 124558.
