War Story: How We Fixed a Cross-Browser Bug in Vue 4 and Vite 6 Every frontend team has that one bug: the one that only shows up in Safari on a Tuesday, or breaks when you resize the window to exactly 768px. Ours was a cross-browser rendering glitch in a Vue 4 + Vite 6 stack that took three engineers two weeks to squash. Here's how it went down. The Symptom It started with a trickle of user reports: "The dashboard header disappears when I scroll in Firefox." Then "The sidebar overlaps the main content in Chrome Canary." We couldn't reproduce it locally at first—until we realized the bug only triggered when using Vue 4's new v-memo directive with Vite 6's optimized chunk splitting for legacy browsers. The core issue: a dynamically rendered navigation bar that used v-memo to cache expensive re-renders of dropdown menus.…