The update banner that shows during an auto-update download was
hosting three inline-styled divs in a row for its progress
indicator:
<div style="display: none; flex: 1; margin: 0 15px;">
<div style="background: rgba(0,0,0,0.3); border-radius: 4px;
height: 8px; overflow: hidden;">
<div id="updateProgressBar"
style="background: white; height: 100%; width: 0%;
transition: width 0.3s;">
Renderer-updates.ts kept reaching in to mutate
updateProgressBar.style.width as the download advanced — works,
but the bar's static look-and-feel (rounded, dark track, 8px tall,
white fill, 0.3s transition) was buried in HTML attributes
instead of CSS.
Extracted to:
- .update-banner-progress-wrap (the flex:1 container with side
margin)
- .update-banner-progress-track (the rounded dark track)
- .update-banner-progress-bar (the white fill, 0% default, transition)
The JS continues to drive width via style.width, which now layers
on top of the class's transition for the smooth animation. Zero
visual change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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