diff --git a/experiments/outline-editor/editor.js b/experiments/outline-editor/editor.js
index 5ae4e09..02ebcc6 100755
--- a/experiments/outline-editor/editor.js
+++ b/experiments/outline-editor/editor.js
@@ -216,7 +216,7 @@ var attributes = {
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -      
 
-// XXX convert auto-heading to markdown heading level and back...
+// XXX revise headings...
 var blocks = {
 	__proto__: plugin,
 
@@ -1155,6 +1155,9 @@ var JSONOutline = {
 					: undefined
 			} else if(type == 'attr' 
 					|| type == undefined){
+				// special case: dataset attrs...
+				if(type == undefined){
+					attr = 'data-'+ attr }
 				typeof(value) == 'boolean'?
 						(value ?
 							attrs.push(attr)
@@ -1602,16 +1605,20 @@ var Outline = {
 				value ?
 					node.classList.add(attr)
 					: node.classList.remove(attr) 
-
-			} else if(type == 'attr' 
-					|| type == undefined){
+			} else if(type == 'attr'){
 				typeof(value) == 'boolean'?
 						(value ?
 							node.setAttribute(attr, '')
 							: node.removeAttribute(attr))
 					: value != null ?
 						node.setAttribute(attr, value)
-					: node.removeAttribute(attr) } }
+					: node.removeAttribute(attr) 
+			// dataset...
+			} else {
+				if(value == null){
+					delete node.dataset[attr]
+				} else {
+					node.dataset[attr] = value } } }
 		this.__change__()
 		return node },
 
@@ -1861,6 +1868,8 @@ var Outline = {
 		var attrs = this.__block_attrs__
 		var cls_attrs = ['focused']
 		return {
+			// NOTE: this is first to prevent it from overriding system attrs...
+			...elem.dataset,
 			text: elem.querySelector('.code').value,
 			...(Object.entries(attrs)
 				.reduce(function(res, [attr, type]){
diff --git a/experiments/outline-editor/index.html b/experiments/outline-editor/index.html
index 7712693..4a99aeb 100755
--- a/experiments/outline-editor/index.html
+++ b/experiments/outline-editor/index.html
@@ -143,13 +143,19 @@ var setup = function(){
         |text|text|text|
   -
 - ## ToDo:
+  - attributes: `.data(..)`: read in element attributes...
+    - would be logical to store system attrs (`.__block_attrs__`) as attrs while the rest as data-attrs - this would bot simplify retrieval and avoid shadowing html attrs...
+    - TEST: this item has attr `moo` with value `"foo"`
+      moo::foo
+    - need a way to remove attributes from editor -- `null` or `undefined` special values??
+  - attributes: need to show/hide the attributes -- option?
   - TOC: Q: should we have both manual and auto headings???
     - IMHO: no...
   - DONE TOC: headings that do not show up in toc -- `# ...` shows up while `@ ...` does not...
-  - TOC: tweaking: add args like depth, ...
+  - TOC: tweaking: add args like depth, ... -- as attributes...
   - ASAP: expand sub-tree on follow link...
   - export auto-headings as normal/manual markdown headings...
-    - plugin callback on save...
+    - add plugin callback on `.text(..)` / ...
   - Time to think about a standalone client -- at least to edit own notes as a test...
     - _also this would be a nice opportunity to start the move to a newer electron version_
   - Might be a good idea to think how to avoid the constant selections on focus...