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I just generated a waterfall of the front page of Drupal.org for an example, and noticed that search-btn.png is using the same styling as https://drupal.org/sites/all/themes/bluecheese/images/sprites.png (and indeed Get started with Drupal etc. use those for background), but it's a standalone button image. This could be styled using CSS instead of an image button or whatever it is currently to save the extra HTTP request.
Comments
Comment #1
drummThe search button is now pure CSS, not a sprite. This was likely changed during the D7 upgrade.