Plan 016 B2, phase 1. Below 600px the grid drops its sidebar column,
`bottom-nav` becomes the primary navigation, and the shell fits the
viewport instead of scrolling sideways out of it.
600 rather than the sidebar's own 900, because 900 is a laptop and the
answer there is a narrower sidebar, which is still a sidebar. Under 600
there is no room for one at all: 360px of viewport over a 200px nav is
not a layout.
**The tab bar is four destinations and a way to everything else.**
Three to five is where touch targets stop being thumb-sized -- eleven
over 360px is 32px each -- so the four are the ones plan 016's subset
says a phone is for, and "More" opens the *existing* `app-sidebar` in a
drawer rather than listing the destinations a second time. Two lists is
two places to add the next view to.
That reuse has a cost this found the hard way: a shared component
brings its `data-testid`s with it, so rendering the drawer's sidebar
unconditionally put a second `nav-home` (and ten siblings) in the DOM
and **failed 30 existing specs** with "resolved to 2 elements" -- on a
desktop viewport, where this element is `display: none` and the drawer
can never open. It renders only while the drawer is open, and the
component test asserts the absence, because the failure is invisible
from inside the component and lands in files nobody touched.
**What made the shell overflow was minimums, not padding.** Measured at
360px: the body was 652px wide, because a `min-width` in a flex row is
a hard floor and a grid item's implicit minimum is its content. So
`min-width: 0` on the boxes between the viewport and the content, and
each component stands its own non-essential parts down in its *own*
stylesheet -- search-bar's 200px floor, job-indicator's label (the
visible one; the live region that announces it is untouched),
audio-player's seek bar and volume. A media query inside a shadow root
is answered by the viewport, so this is the component saying what it
drops rather than the shell reaching in.
Volume goes because the hardware keys own it on a phone, which is the
same reason mediacontrols' Android handler implements no volume
callback. Seeking goes because 4px is not a thumb target; it belongs to
the full-screen now-playing view, which is the next phase.
An existing spec therefore asserts the opposite of what it did:
layout-overflow's 320px case used to require that the 464px behind
`overflow: hidden` could be *scrolled to*, which was the remedy
available while the shell had one layout. It reflows now -- 320px in a
320px viewport, exactly -- and reflow is what WCAG 1.4.10 asked for.
`seek-bar` renders `PlaybackPositionChanged` instead of counting: its
setInterval survives only as interpolation *between* reports, stopped
and restarted by every one of them, so its error is bounded by a
second and is discarded rather than carried. Measured after: UI 00:34
/ backend 34 across two keyboard seeks, against 00:44 / 73 before.
The bar also stops lying about smaller things: the right-hand clock
carries a minus sign and toggles to total duration on click, and the
now-playing column starts at 320 px instead of 200, which is where
"The Orchestra Of" came from.
`now-playing.updated()` used to measure and rewrite its text geometry
on every pass — six querySelectors and a read/write interleave — while
the player store notifies at 1 Hz. It now runs only when its geometry
key changes: the rendered title, the rendered artist, both scroll
flags, or the ResizeObserver reporting a resize, with every read
before every write. Over six seconds of playback: 52 forced layouts
-> 2, and 3.2 ms -> 0.9 ms inside updated().
The scroll flags are in that key because `.will-scroll .scroll-content`
carries `padding-right: 2em`, so applying the class changes the
distance the marquee travels — -128 px before it, -158 px after. A
guard on the text alone leaves every first hover scrolling short, and
nothing in any test tier would have caught it.
The resize's document listeners now attach on mousedown and detach on
mouseup, rather than running on every pointer move in the app for the
life of the process.
- Sidebar: convert all em-based padding/gap to px values, icon sizes to --yj-icon-md
- Now-playing: cover placeholder icon to --yj-icon-lg, text sizes to type tokens
- Search-bar: search icon to --yj-icon-sm, input font to --yj-text-md
- Audio-player: convert em-based gap/padding/margin to px values
- Seek-bar: tooltip font to --yj-text-lg, margin from em to px
- Volume-control: padding/margin from em to px, thumb sizes from em to px
- All components import designTokens and include in static styles
logan
yonlu
Logan Jones