Theme edits that survive a sale weekend

Sale weekends expose theme debt that quiet Tuesdays forgive. Discount banners, countdown-free urgency blocks (we avoid fake scarcity, but merchants still overload the cart drawer), and last-minute app installs stack scripts until “Add to cart” hesitates.

Before you edit

1. Snapshot the live theme and note every installed app that injects scripts
2. Reproduce the customer path on a staging theme with the same apps
3. Measure time-to-interactive on mobile for product and cart — not just homepage vanity

During the edit

Change one concern at a time. If you are adjusting gift-card UX, do not also rewrite collection filtering in the same deploy. Customisation reviews at Desktop Maple repeatedly find dual changes that make rollback guesswork.

After the edit

Run a refund on a test order, apply a stackable discount, and complete checkout with a stored card and a guest account. Theme work that only tests a happy-path Visa purchase is incomplete for Australian merchants who lean on Afterpay-style flows and gift cards.

Customisation is programming consulting work even when no “backend” is mentioned. The browser is part of the order path.