Subtle Changes

A developer adds a global CSS reset that strips hover styles from links and buttons. On hover, buttons no longer change color or shadow — they look exactly the same as at rest. Visitors get zero visual feedback that something is clickable. Click rates drop and nobody understands why. The change was part of a big CSS refactor, nobody checked hover states. Delta-QA captures elements in hover state and compares screenshots: buttons that no longer change appearance on hover jump out immediately in the diff.

A developer changes global link styles and, as a side effect, links within body text lose their underline and distinct color. They now look just like regular text — same color, same style. Your visitors no longer know where to click in your articles and content pages. The developer checked the main navigation (which uses specific classes), not the in-content links. Delta-QA compares screenshots and highlights links that no longer stand out from the text — the missing underline and distinct color are visible in the diff.

A CSS change overwrites the custom scrollbar styles. The thin, elegant scrollbar is replaced by the browser's default — thick and gray. The site loses its polish and the content area looks visually narrower. It's the kind of regression nobody actively looks for — you vaguely notice it without identifying the cause. Delta-QA compares screenshots and highlights the change — the thick bar replacing the custom design stands out in the overlay.

A developer introduces a new CSS reset that changes -webkit-font-smoothing from antialiased to auto. On macOS, all text on the site looks bolder and less crisp — as if someone slightly blurred the typography. Your Mac users perceive the site as "less polished" without being able to put their finger on it. It passed in staging because the test environment ran on Linux with different rendering. Delta-QA compares screenshots and detects the rendering change — the bolder, less sharp characters stand out in the overlay.