diff --git a/experiments/outline-editor/editor.css b/experiments/outline-editor/editor.css
index e15df90..1ba8656 100755
--- a/experiments/outline-editor/editor.css
+++ b/experiments/outline-editor/editor.css
@@ -1,9 +1,24 @@
 
+/*********************************************************************/
+
 :root {
 	--font-size: 5mm;
+
+	--outline-padding: 5rem;
+
+	--item-indent: 2rem;
 	--item-padding: 0.2em;
+
+	--checkbox-size: 1.5rem;
+
 	--button-size: 2em;
 
+}
+
+
+/*********************************************************************/
+
+:root {
 	font-family: sans-serif;
 	font-size: var(--font-size);
 
@@ -25,22 +40,26 @@
 .editor .outline {
 	display: block;
 	position: relative;
+
 	/* XXX do a better calculation... */
-	width: calc(100% - (var(--button-size) + 4em));
+	width: calc(100% - var(--button-size) - var(--outline-padding) * 2);
+
+	padding-left: var(--outline-padding);
+	padding-right: var(--outline-padding);
 }
 
 .editor .outline [tabindex] {
 	position: relative;
 }
-.editor .outline div [tabindex] {
-	margin-left: 2em;
+.editor .outline [tabindex] [tabindex] {
+	margin-left: var(--item-indent);
 }
 .editor .outline [tabindex]>span,
 .editor .outline [tabindex]>textarea {
 	display: block;
 	width: 100%;
 	/* XXX this is a tiny bit off and using textarea's height here is off too... */
-	min-height: 1em;
+	min-height: calc(1em + var(--item-padding) * 2);
 	padding-top: var(--item-padding);
 	padding-bottom: var(--item-padding);
 	padding-left: 0;
@@ -55,6 +74,9 @@
 	outline: none;
 	border: none;
 }
+.editor .outline [tabindex]>span:blank {
+	content: " ";
+}
 .editor .outline [tabindex]>textarea {
 	height: calc(2 * var(--item-padding) + 1em);
 	overflow: hidden;
@@ -87,7 +109,66 @@
 .editor .outline div[collapsed] {
 	border-bottom: solid 1px silver;
 }
-.editor .outline div[collapsed] div {
+/* expand/collapse button... */
+.editor .outline [tabindex]:after {
+	--size: 0.5rem;
+
+	content: "";
+	position: absolute;
+	display: inline-block;
+	top: calc(1em / 2);
+	right: calc(-1rem + -1 * var(--size) - var(--item-padding));
+	width: 0;
+	height: 0;
+	border: solid calc(var(--size) / 1.2) transparent;
+	border-top: solid var(--size) black;
+	opacity: 0;
+}
+.editor .outline [tabindex][collapsed]:after {
+	border: solid calc(var(--size) / 1.2) transparent;
+	border-left: solid var(--size) black;
+	margin-right: -0.25rem;
+	opacity: 0.1;
+}
+.editor .outline [tabindex]:hover:after {
+	opacity: 0.1;
+}
+/* click/tap zone for expand button... */
+.editor .outline [tabindex]>span:before {
+	content: "";
+	position: absolute;
+	display: inline-block;
+	right: -2rem;
+	width: 2rem;
+	height: calc(1em + var(--item-padding) * 2);
+}
+/*
+.editor .outline div[collapsed]:before,
+.editor .outline div[collapsed]:after {
+	--size: 0.3em;
+
+	content: "";
+	display: inline-block;
+	position: absolute;
+	width: var(--size);
+	height: var(--size);
+	bottom: 0;
+	right: calc(-1 * var(--size));
+	margin-bottom: calc(var(--size) / -2 - 0.5px);
+	rotate: -45deg;
+	box-sizing: border-box;
+
+	color: silver;
+	border-top: solid 1px silver;
+	border-left: solid 1px silver;
+}
+.editor .outline div[collapsed]:before {
+	right: auto;
+	left: calc(-1 * var(--size));
+	rotate: 135deg;
+}
+*/
+.editor .outline div[collapsed] [tabindex] {
 	display: none;
 }
 
@@ -119,6 +200,7 @@
 /*-------------------------------------------------------------------*/
 /* Styles */
 
+/* Headings... */
 .editor .outline .heading-1>span,
 .editor .outline .heading-1>textarea,
 .editor .outline .heading-2>span,
@@ -139,7 +221,7 @@
 .editor .outline .heading-2>textarea,
 .editor .outline .heading-3>span,
 .editor .outline .heading-3>textarea {
-	border-bottom: solid 1px rgba(0,0,0,0.05);
+	border-bottom: solid 1px rgba(0,0,0,0.1);
 }
 
 .editor .outline .heading-1>span,
@@ -195,24 +277,48 @@
 	color: silver;
 }
 
-.editor .outline [tabindex]>span>input[type=checkbox].check,
-.editor .outline [tabindex]>span>input[type=checkbox].todo {
-	--size: 1.5rem;
-	--height: calc(var(--font-size) + 2 * var(--item-padding));
 
-	top: calc(0.6em + var(--item-padding));
-	height: var(--size);
-	width: var(--size);
-	margin-top: calc(var(--size) / -2);
+/* checkboxes... */
+:root {
+	/* NOTE: this must have a unit... */
+	/* XXX move this to the config when fixed... */
+	/* XXX setting this to >0em will add margins to both sides of 
+	* 	the inline checkbox even if it is the first thing in the 
+	* 	element -- can's seem to figure out a way to avoid this */
+	--checkbox-margin: 0em;
+}
+/* align todo checkboxes to indnt (otherwise they are on the indent) */
+.editor .outline [tabindex].todo>span {
+	margin-left: var(--checkbox-size);
+	padding-left: calc(
+		var(--item-padding)
+		+ var(--checkbox-margin) * 2);
+}
+.editor .outline [tabindex].check>span>input[type=checkbox],
+.editor .outline [tabindex].todo>span>input[type=checkbox] {
+	height: var(--checkbox-size);
+	width: var(--checkbox-size);
+
+	margin-top: calc(var(--checkbox-size) / -2);
+	margin-left: var(--checkbox-margin);
+	margin-right: var(--checkbox-margin);
+
+	transform: translateY(calc(2 * var(--item-padding)));
 
 	/* NOTE: this appears to be needed for the em sizes above to work correctly */
 	font-size: 1em;
 }
-.editor .outline [tabindex]>span>input[type=checkbox].todo {
-	position: absolute;
-	margin-left: calc(-1 * var(--size) - var(--item-padding) * 2);
+.editor .outline [tabindex].todo>span>input[type=checkbox]:first-child {
+	margin-left: calc(
+		var(--checkbox-size) * -1
+		- var(--item-padding)
+		- var(--checkbox-margin) * 2);
+	margin-right: calc(
+		var(--item-padding)
+		+ var(--checkbox-margin));
 }
-.editor .outline [tabindex]>span>input[type=checkbox].check {
-	transform: translateY(calc(2 * var(--item-padding)));
+/* XXX need to remove left margin from strictly the first itme in block... */
+.editor .outline [tabindex].check>span>input[type=checkbox] {
+	/*margin-left: 0;*/
 }
 
diff --git a/experiments/outline-editor/editor.js b/experiments/outline-editor/editor.js
index 8d0dd0a..5061dcf 100755
--- a/experiments/outline-editor/editor.js
+++ b/experiments/outline-editor/editor.js
@@ -195,7 +195,7 @@ var Outline = {
 				// heading...
 				parsed.style ?
 					node.classList.add(...parsed.style)
-					: node.classList.remove(...this.__styles__)
+					: node.classList.remove(...this.__styles)
 			} else {
 				html.innerHTML = data.text }
 			text.value = data.text
@@ -259,7 +259,9 @@ var Outline = {
 		if(elem.classList.contains('focused')){
 			// XXX need to be able to get the next elem on same level...
 			this.toggleCollapse(elem, true)
-			next = this.get(elem, 'next') }
+			next = elem === this.get(-1) ?
+				this.get(elem, 'prev') 
+				: this.get(elem, 'next') }
 		elem?.remove()
 		next?.focus()
 		return this },
@@ -269,33 +271,27 @@ var Outline = {
 		return this },
 
 	// block serialization...
-	// XXX shouild we support headings + other formatting per block???
 	// XXX split this up into a generic handler + plugins...
 	// XXX need a way to filter input text...
 	// 		use-case: hidden attributes...
-	__styles__: [
-		'heading-1',
-		'heading-2',
-		'heading-3',
-		'heading-4',
-		'heading-5',
-		'heading-6',
-		'list',
-	],
+	// NOTE: this is auto-populated by .__code2html__(..)
+	__styles: undefined,
 	__code2html__: function(code){
+		var that = this
 		var elem = {
 			collapsed: false,
 		}
-		var heading = function(level){
+		var style = function(style, code=undefined){
+			style = [style].flat()
+			that.__styles = [...new Set([
+				...(that.__styles ?? []),
+				...style,
+			])]
 			return function(_, text){
 				elem.style ??= []
-				elem.style.push('heading-'+level)
-				return text } }
-		var style = function(style){
-			return function(_, text){
-				elem.style ??= []
-				elem.style.push(style)
-				return text } }
+				elem.style.push(...style)
+				return code 
+					?? text } }
 		elem.text = code 
 			// hidden attributes...
 			// XXX make this generic...
@@ -328,12 +324,12 @@ var Outline = {
 			// elements...
 			.replace(/(\n|^)---*\h*(\n|$)/m, '$1<hr>')
 			// ToDo...
-			.replace(/^TODO\s*(.*)$/m, '<input class="todo" type="checkbox">$1')
-			.replace(/^DONE\s*(.*)$/m, '<input class="todo" type="checkbox" checked>$1')
+			.replace(/^TODO\s*/m, style('todo', '<input type="checkbox">'))
+			.replace(/^DONE\s*/m, style('todo', '<input type="checkbox" checked>'))
 			// checkboxes...
 			// XXX these can not be clicked (yet)...
-			.replace(/\[_\]/gm, '<input class="check" type="checkbox">')
-			.replace(/\[[X]\]/gm, '<input class="check" type="checkbox" checked>')
+			.replace(/\[_\]/gm, style('check', '<input class="check" type="checkbox">'))
+			.replace(/\[[X]\]/gm, style('check', '<input class="check" type="checkbox" checked>'))
 			// basic styling...
 			// XXX these are quite naive...
 			.replace(/\*(.*)\*/gm, '<b>$1</b>')
@@ -427,6 +423,7 @@ var Outline = {
 		var block = document.createElement('div')
 		block.setAttribute('tabindex', '0')
 		var text = document.createElement('textarea')
+			.autoUpdateSize()
 		var html = document.createElement('span')
 		block.append(text, html)
 		this.update(block, data)
@@ -437,9 +434,12 @@ var Outline = {
 				'before'
 				: place
 			;(place == 'next' 
-					&& (cur.querySelector('[tabindex]') 
+					&& (cur.querySelector('[tabindex]')
 						|| cur.nextElementSibling)) ?
 				this.get(place).before(block)
+			: (place == 'next' 
+					&& !cur.nextElementSibling) ?
+				cur.after(block)
 			: (place == 'before' || place == 'after') ?
 				cur[place](block)
 			: undefined }
@@ -609,6 +609,10 @@ var Outline = {
 		outline.addEventListener('click', 
 			function(evt){
 				var elem = evt.target
+				// expand/collapse...
+				// XXX
+				if(elem.getAttribute('collapsed')){
+				}
 				// todo: toggle checkbox...
 				if(elem.classList.contains('todo')){
 					var node = elem.parentElement.parentElement
diff --git a/experiments/outline-editor/index.html b/experiments/outline-editor/index.html
index 92785b3..e6de346 100755
--- a/experiments/outline-editor/index.html
+++ b/experiments/outline-editor/index.html
@@ -28,7 +28,14 @@ var setup = function(){
 	<!-- code -->
 	<div class="code">
 - # Outline editor prototype
+  - An outline-based markdown editor experiment
+  - ### Infuences::
+    - Logseq
+	- Tomboy
+	- Bonsai
+  - 
 - ## ToDo
+  - read-only mode
   - editor: bksapce/del at start/end of a block should join it with prev/next
   - editor: pressing enter in text edit mode should split text into two blocks
   - editor: caret
@@ -51,7 +58,8 @@ var setup = function(){
     - indent/deindent
     - edit node
   - copy/paste nodes/trees
-  - markdown tables
+  - markdown: tables
+  - empty item height is a bit off...
   - ~serialize~/deserialize
   - ~add optional text styling to nodes~
   - 
@@ -77,8 +85,9 @@ var setup = function(){
     - Basic inline *bold*, _italic_ and ~striked~
 	- To do items
 	  - TODO undone item
-	  - DONE done item
         _(clicking the checkbox updates the item)_
+	  - DONE done item
+	  - [_] a different way to draw a checkbox
     - Inline [X] checkboxes [_]
   - A
     collapsed:: true