rework sidenotes with pure css

src/lib/Post.svelte

@@ -9,6 +9,8 @@
 
 <script>
     export let title, date;
+    export const description = '';
+    export const draft = false;
 </script>
 
 <svelte:head>

src/lib/Sidenote.svelte

@@ -18,6 +18,7 @@
     }
 
     .sidenote {
+        color: #555;
         font-size: 0.8rem;
 
         &:before {
@@ -40,10 +41,15 @@
         }
 
         .sidenote {
-            position: absolute;
-            left: calc(50vw + var(--content-width) / 2 + 1rem);
-            max-width: 12rem;
+            --gap: 2rem;
+            --sidenote-width: min(14rem, calc(50vw - var(--gap) - var(--content-width) / 2));
+            max-width: var(--sidenote-width);
             hyphens: auto;
+            position: relative;
+            float: right;
+            clear: right;
+            margin-right: calc(0rem - var(--sidenote-width) - var(--gap)); // gives us 2rem of space between content and sidenote
+            margin-bottom: 0.7rem;
         }
     }
 
@@ -91,69 +97,29 @@
 </style>
 
 <script context="module">
-    import { browser } from '$app/env';
-    var sidenotes = {};
-
-    function tileNotes() {
-        // find and fix collisions between sidenotes
-        const minNoteGap = 15;
-        var prevBottom = 0;
-        Object.values(sidenotes).forEach(s => {
-            if (window.getComputedStyle(s.note).position === 'fixed') {
-                // fixed position means we are in mobile territory,
-                // so get rid of the overflow stuff
-                s.note.style.top = '';
-                return;
-            }
-
-            let labelTop = s.label.getBoundingClientRect().y;
-            if (labelTop === 0) {
-                // sometimes we get spurious results, only in dev mode though
-                // I think it's related to hot module reloading
-                return;
-            }
-            labelTop += window.scrollY;
-
-            let noteHeight = s.note.getBoundingClientRect().height;
-            if (labelTop < prevBottom + minNoteGap) {
-                // there is a collision
-                s.note.style.top = `${prevBottom + minNoteGap}px`;
-                prevBottom = prevBottom + minNoteGap + noteHeight;
-            }
-            else {
-                // no collision, but these don't quite match otherwise
-                s.note.style.top = `${labelTop}px`;
-                prevBottom = labelTop + noteHeight;
-            }
-        })
-    }
-
-    if (browser) {
-        window.addEventListener('resize', tileNotes);
-    }
+    var activeToggle = null;
 </script>
 
 <script>
-    import { onMount } from 'svelte';
-
     const id = Math.random().toString().slice(2);
-    sidenotes[id] = {mounted: false};
-    let label;
-    let note;
+    let toggle;
 
-    onMount(async () => {
-        sidenotes[id] = {mounted: true, label, note};
-        if (Object.values(sidenotes).every(n => n.mounted)) {
-            // all sidenotes have been mounted, now we can fix the collisions
-            tileNotes();
+    function toggleState() {
+        if (activeToggle === toggle) {
+            activeToggle = null;
         }
-
-        return () => sidenotes[id].mounted = false;
-    });
+        else if (activeToggle !== null) {
+            activeToggle.checked = false;
+            activeToggle = toggle;
+        }
+        else {
+            activeToggle = toggle;
+        }
+    }
 </script>
 
-<label bind:this={label} for={id} class="counter"></label>
-<input type="checkbox" class="sidenote-toggle" {id}/>
-<span bind:this={note} class="sidenote">
+<label for={id} on:click={toggleState} class="counter"></label>
+<input {id} bind:this={toggle} type="checkbox" class="sidenote-toggle" />
+<span class="sidenote">
     <slot></slot>
 </span>