One drawback to my recent example of a CSS3 animated gallery with persistent images is that the technique used anchor tags referenced from a URL. This works perfectly well when the user is directed to the page via a URL that contains an anchor identifier, as in the link I’ve used in the previous sentence:

<a href=/643/Animated-Gallery-With-Persistent-Images#aussie>the recent example… </a>

… but it becomes an issue if the visitor follows a link to the page that does not contain a hash, such as URLs listed at Google or other sources. In that case, the gallery will not have any anchor information to work from, and thus not present a large image by default.

To solve this problem, we can employ a simple, single line of JavaScript in the head section of the gallery page:

if (!window.location.hash) { window.location.hash = "aussie"; }

Very simply, this code checks for the presence of an anchor in the current URL: if an anchor is not found, JavaScript inserts one itself. This anchor will then be read by the CSS in the gallery page, which will present the image with the matching id.

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