diff --git a/txt.js/txt.js b/txt.js/txt.js
index 2177fb3..42f977c 100644
--- a/txt.js/txt.js
+++ b/txt.js/txt.js
@@ -1,60 +1,470 @@
-this.txtjs = {};
+let txtjs = {}
 
 txtjs.open = function(url) {
-    Ox.load(function() {
-        Ox.get(url, function(text) {
-            var $body = Ox.$('body')
-                    .css({
-                        backgroundColor: 'rgb(255, 255, 255)',
-                        overflowX: 'hidden'
-                    }),
-                $text = Ox.$('<div>')
-                    .css({
-                        padding: '10% 20% 10% 10%',
-                        fontFamily: 'Georgia, Palatino, DejaVu Serif, Book Antiqua, Palatino Linotype, Times New Roman, serif',
-                        fontSize: '20px',
-                        lineHeight: '30px'
-                    })
-                    .appendTo($body),
-                $scroll = Ox.$('<div>')
-                    .css({
-                        position: 'fixed',
-                        right: '24px',
-                        top: '16px',
-                        width: '7%',
-                        bottom: '16px',
-                        overflow: 'hidden'
-                    })
-                    .appendTo($body),
-                $scrollText = Ox.$('<div>')
-                    .css({
-                        fontSize: '2px',
-                        lineHeight: '3px',
-                        cursor: 'pointer',
-                        WebkitUserSelect: 'none'
-                    })
-                    .on({
-                        mousedown: function(e) {
-                            var offset = 'offsetY' in e ? e.offsetY : e.layerY;
-                            document.documentElement.scrollTop = offset / factor + margin - 16;
-                        }
-                    })
-                    .appendTo($scroll),
-                factor, margin;
-            text = Ox.encodeHTMLEntities(text)
-                .replace(/\r\n/g, '\n')
-                .replace(/[\r\n]/g, '<br>');
-            $text.html(text);
-            $scrollText.html(text);
-            window.onresize = function() {
-                margin = $text.width() * 0.1;
-                factor = $scrollText[0].clientHeight / $text[0].clientHeight;
-            };
-            window.onscroll = function() {
-                $scroll[0].scrollTop = (window.pageYOffset - margin + 16) * factor;
-            };
-            window.onresize();
-        });
-    });
-};
+    fetch(url).then(function(response) {
+        return response.text()
+    }).then(txtjs.renderText)
+}
 
+txtjs.mark = function(notes) {
+    notes.forEach(function(note) {
+        if (!txtjs.notes.includes(note)) {
+            txtjs.notes.push(note)
+        }
+        txtjs.renderNote(note)
+    })
+}
+
+txtjs.notes = []
+
+;(function() {
+    let listener = addEventListener || attachEvent
+    let event = addEventListener ? 'message' : 'onmessage'
+    listener(event, function(e) {
+        let message = JSON.parse(e.message || e.data)
+        txtjs.onMessage(message.action, message.data)
+    })
+}())
+
+txtjs.addNoteFromSelection = function() {
+    let note = txtjs.getNoteFromSelection()
+    if (!note || txtjs.noteExists(note)) {
+        return
+    }
+    txtjs.renderNote(note)
+    txtjs.notes.push(note)
+    txtjs.selectNote(note.id)
+    getSelection().removeAllRanges()
+    txtjs.postMessage('addNote', note)
+}
+
+txtjs.cancelEdit = function() {
+    let editing = document.querySelector('g.editing')
+    editing && editing.classList.remove('editing')
+}
+
+txtjs.createSVGElement = function(name) {
+    return document.createElementNS('http://www.w3.org/2000/svg', name)
+}
+
+txtjs.editNote = function() {
+    let editing = document.querySelector('g.editing')
+    let note = txtjs.getNoteFromSelection()
+    if (!editing || !note) {
+        return
+    }
+    let id = txtjs.getNoteId(editing)
+    note = Object.assign(Ox.getObjectById(txtjs.notes, id), {
+        position: note.position,
+        text: note.text
+    })
+    document.querySelector('svg').removeChild(editing)
+    txtjs.renderNote(note)
+    txtjs.selectNote(note.id)
+    txtjs.postMessage('editNote', {
+        id: id,
+        position: note.position,
+        text: note.text
+    })
+}
+
+txtjs.getNewId = function() {
+    let ids = txtjs.notes.map(function(note) {
+        return note.id
+    })
+    let i = 1
+    while (ids.includes(Ox.encodeBase26(i))) {
+        i++
+    }
+    return Ox.encodeBase26(i)
+}
+
+txtjs.getNoteId = function(element) {
+    let classNames = Array.from(element.classList).filter(function(className) {
+        return className.startsWith('note-')
+    })
+    if (classNames.length == 0) {
+        return
+    }
+    return classNames[0].substr(5)
+}
+
+txtjs.getNoteFromSelection = function() {
+    let selection = getSelection()
+    try {
+        var range = selection.getRangeAt(0)
+    } catch(e) {
+        return
+    }
+    if (range.collapsed) {
+        return
+    }
+    let container = range.commonAncestorContainer
+    if (container.id != 'txt') {
+        while (container != document.body) {
+            container = container.parentElement
+            if (container.id == 'txt') {
+                break
+            }
+        }
+    }
+    if (container.id != 'txt') {
+        return
+    }
+    let position = txtjs.getPosition(range)
+    let pos = position.split(':').map(function(v) {
+        return parseInt(v)
+    })
+    let note = {
+        id: txtjs.getNewId(),
+        position: position,
+        text: txtjs.text.substr(pos[0], pos[1] - pos[0]),
+        editable: true
+    }
+    if (txtjs.noteExists(note)) {
+        return
+    }
+    return note
+}
+
+txtjs.getPosition = function(range) {
+    let container = document.querySelector('#txt')
+    let nodes = Array.from(container.childNodes)
+    let startNodeIndex = nodes.indexOf(range.startContainer)
+    let endNodeIndex = nodes.indexOf(range.endContainer)
+    let index = 0
+    let start = 0
+    let end = 0
+    for (let i = 0; i <= endNodeIndex; i++) {
+        if (i == startNodeIndex) {
+            start = index + range.startOffset
+        }
+        if (i == endNodeIndex) {
+            end = index + range.endOffset
+        }
+        if (nodes[i].nodeType == 1) { // <br>
+            index++
+        } else {
+            index += nodes[i].textContent.length
+        }
+    }
+    return start + ':' + end
+}
+
+txtjs.getRange = function(id, start, end) {
+    let startContainer, startOffset, endContainer, endOffset
+    let container = document.querySelector('#' + id)
+    let nodes = Array.from(container.childNodes)
+    let index = 0
+    for (let i = 0; i < nodes.length; i++) {
+        if (start < index + nodes[i].textContent.length && startOffset === void 0) {
+            startContainer = nodes[i]
+            startOffset = start - index
+        }
+        if (end <= index + nodes[i].textContent.length) {
+            endContainer = nodes[i]
+            endOffset = end - index
+            break
+        }
+        if (nodes[i].nodeType == 1) { // <br>
+            index++
+        } else {
+            index += nodes[i].textContent.length
+        }
+    }
+    let range = document.createRange()
+    range.setStart(startContainer, startOffset)
+    range.setEnd(endContainer, endOffset)
+    return range
+}
+
+txtjs.getSelectedNote = function() {
+    let elements = Array.from(document.querySelectorAll('g.selected'))
+    if (elements.length == 0) {
+        return
+    }
+    let id = txtjs.getNoteId(elements[0])
+    return Object.assign(Ox.getObjectById(txtjs.notes, id), {
+        elements: elements
+    })
+}
+
+txtjs.moveNote = function() {
+    let selected = txtjs.getSelectedNote()
+    if (!selected || !selected.elements[0].classList.contains('editable')) {
+        return
+    }
+    selected.elements.forEach(function(element) {
+        element.classList.add('editing')
+    })
+}
+
+txtjs.noteExists = function(note) {
+    return txtjs.notes.some(function(note_) {
+        return note_.position == note.position
+    })
+}
+
+txtjs.onMessage = function(action, data) {
+
+}
+
+txtjs.postMessage = function(action, data) {
+    console.log('postMessage', action, data)
+    parent.postMessage(JSON.stringify({action: action, data: data}), '*')
+}
+
+txtjs.removeNote = function() {
+    let selected = txtjs.getSelectedNote()
+    if (!selected) {
+        return
+    }
+    let id = txtjs.getNoteId(selected.elements[0])
+    selected.elements.forEach(function(element) {
+        element.parentElement.removeChild(element)
+    })
+    let index = txtjs.notes.map(function(note) {
+        return note.id
+    }).indexOf(id)
+    txtjs.notes.splice(index, 1)
+    txtjs.postMessage('removeNote', {
+        id: id
+    })
+}
+
+txtjs.renderNote = function(note) {
+    let pos = note.position.split(':').map(function(v) {
+        return parseInt(v)
+    })
+    let ids = ['txt', 'txt-scroll']
+    ids.forEach(function(id) {
+        let range = txtjs.getRange(id, pos[0], pos[1])
+        let rects = Array.from(range.getClientRects())
+        let size = rects.reduce(function(width, rect) {
+            return width + rect.width
+        }, 0)
+        let maxHeight = 8192
+        let firstIndex = Math.floor((rects[0].top + window.pageYOffset) / maxHeight)
+        let lastIndex = Math.floor((rects[rects.length - 1].top + window.pageYOffset + rects[rects.length - 1].height) / maxHeight)
+        for (let index = firstIndex; index <= lastIndex; index++) {
+            let g = txtjs.createSVGElement('g')
+            g.classList.add('note-' + note.id)
+            g.classList.add('selectable')
+            if (note.editable) {
+                g.classList.add('editable')
+            }
+            g.setAttribute('data-size', size)
+            g.setAttribute('pointer-events', id == 'txt' ? 'all' : 'none')
+            rects.forEach(function(rect) {
+                let element = txtjs.createSVGElement('rect')
+                let x = id == 'txt' ? rect.left
+                    : rect.left - document.querySelector('#scroll').getBoundingClientRect().left + 8
+                let y = id == 'txt' ? rect.top + window.pageYOffset - index * maxHeight
+                    : rect.top + document.querySelector('#scroll').scrollTop - 16 - index * maxHeight
+                element.setAttribute('x', x)
+                element.setAttribute('y', y)
+                element.setAttribute('width', rect.width)
+                element.setAttribute('height', rect.height)
+                g.appendChild(element)
+            })
+            let svg = document.querySelector('svg#svg-' + id + '-' + index)
+            for (let i = 0; i < svg.children.length; i++) {
+                let childSize = parseInt(svg.children[i].getAttribute('data-size'))
+                if (size > childSize) {
+                    svg.insertBefore(g, svg.children[i])
+                    break
+                }
+            }
+            if (!g.parentElement) {
+                svg.appendChild(g)
+            }
+        }
+    })
+}
+
+txtjs.renderSVG = function(id, index, width, height) {
+    function mousedown(e) {
+        svg.addEventListener('mouseup', mouseup)
+        timeout = setTimeout(function() {
+            svg.removeEventListener('mouseup', mouseup)
+            e.target.classList.remove('selectable')
+            e.target.setAttribute('pointer-events', 'none')
+            document.addEventListener('mouseup', function() {
+                e.target.classList.add('selectable')
+                e.target.setAttribute('pointer-events', 'all')
+            })
+        }, 250)
+    }
+    function mouseup(e) {
+        clearTimeout(timeout)
+        txtjs.selectNote(txtjs.getNoteId(e.target.parentElement))
+    }
+    let timeout
+    let svg = txtjs.createSVGElement('svg')
+    svg.setAttribute('id', 'svg-' + id + '-' + index)
+    svg.setAttribute('pointer-events', 'none')
+    if (id == 'txt') {
+        svg.style.left = 0
+    } else {
+        svg.style.right = '8px'
+    }
+    svg.style.top = index * 8192 + 'px'
+    svg.style.width = width + 'px'
+    svg.style.height = height + 'px'
+    if (id == 'txt') {
+        svg.addEventListener('mousedown', mousedown)
+    }
+    let parentElement = id == 'txt' ? document.body : document.querySelector('#scroll')
+    parentElement.appendChild(svg)
+}
+
+txtjs.renderSVGs = function() {
+    let maxHeight = 8192
+    let ids = ['txt', 'txt-scroll']
+    ids.forEach(function(id) {
+        let rect = document.querySelector('#' + id).getBoundingClientRect()
+        let lastHeight = rect.height % maxHeight
+        let n = Math.ceil(rect.height / maxHeight)
+        for (let i = 0; i < n; i++) {
+            txtjs.renderSVG(id, i, rect.width, i < n - 1 ? maxHeight : lastHeight)
+        }
+    })
+}
+
+txtjs.renderText = function(text) {
+    txtjs.text = text
+    html = text.replace(/</g, '&lt;').replace(/>/g, '&gt;')
+    html = html.replace().replace(/\r\n/g, '\n').replace(/[\r\n]/g, '<br>')
+    txtjs.html = Ox.encodeHTMLEntities(text).replace(/\r\n/g, '\n').replace(/[\r\n]/g, '<br>')
+    window.addEventListener('resize', onResize)
+    window.addEventListener('resizeend', onResizeend)
+    window.addEventListener('scroll', onScroll)
+    document.addEventListener('keydown', function(e) {
+        console.log(e.keyCode)
+        if (e.keyCode == 13) {        // ENTER
+            txtjs.editNote()
+        } else if (e.keyCode == 27) { // ESCAPE
+            txtjs.selectNote(null)
+            txtjs.cancelEdit()
+        } else if (e.keyCode == 37) { // LEFT
+            txtjs.selectNextNote(-1)
+        } else if (e.keyCode == 39) { // RIGHT
+            txtjs.selectNextNote(1)
+        } else if (e.keyCode == 46) { // DELETE
+            txtjs.removeNote()
+        } else if (e.keyCode == 77) { // M
+            txtjs.moveNote()
+        } else if (e.keyCode == 78) { // N
+            txtjs.addNoteFromSelection()
+        }
+    })
+    let style = document.createElement('style')
+    style.innerText = [
+        'svg { mix-blend-mode: multiply; position: absolute }',
+        'g { fill: rgb(255, 255, 192); fill-opacity: 0.5 }',
+        'g.selectable { cursor: pointer }',
+        'g.editable { fill: rgb(255, 255, 0) }',
+        'g.selected { fill: rgb(224, 240, 255) }',
+        'g.editable.selected { fill: rgb(128, 192, 255) }',
+        'g.editable.editing { fill: rgb(128, 255, 128) }',
+        '::selection { background: rgb(192, 192, 192) }'
+    ].join('\n')
+    document.head.appendChild(style)
+    document.body.style.backgroundColor = 'rgb(255, 255, 255)'
+    document.body.style.margin = 0
+    document.body.style.overflowX = 'hidden'
+    let textElement = document.createElement('div')
+    textElement.id = 'txt'
+    textElement.style.fontFamily = 'Georgia, Palatino, DejaVu Serif, Book Antiqua, Palatino Linotype, Times New Roman, serif',
+    textElement.style.fontSize = '20px'
+    textElement.style.lineHeight = '30px'
+    textElement.style.padding = '10% 20% 10% 10%'
+    textElement.innerHTML = txtjs.html
+    textElement.addEventListener('mousedown', function() {
+        txtjs.selectNote(null)
+    })
+    document.body.appendChild(textElement)
+    let scrollElement = document.createElement('div')
+    scrollElement.id = 'scroll'
+    scrollElement.style.bottom = '16px'
+    scrollElement.style.overflow = 'hidden'
+    scrollElement.style.position = 'fixed'
+    scrollElement.style.right = '24px'
+    scrollElement.style.width = '7%'
+    scrollElement.style.top = '16px'
+    document.body.appendChild(scrollElement)
+    let scrollTextElement = document.createElement('div')
+    scrollTextElement.id = 'txt-scroll'
+    scrollTextElement.style.cursor = 'pointer'
+    scrollTextElement.style.fontFamily = 'Georgia, Palatino, DejaVu Serif, Book Antiqua, Palatino Linotype, Times New Roman, serif',
+    scrollTextElement.style.fontSize = '2px'
+    scrollTextElement.style.lineHeight = '3px'
+    scrollTextElement.style.MozUserSelect = 'none'
+    scrollTextElement.style.WebkitUserSelect = 'none'
+    scrollTextElement.innerHTML = txtjs.html
+    scrollTextElement.addEventListener('mousedown', function(e) {
+        let offset = 'offsetY' in e ? e.offsetY : e.layerY
+        document.documentElement.scrollTop = offset / factor + margin - 16
+    })
+    scrollElement.appendChild(scrollTextElement)
+    txtjs.renderSVGs()
+    let factor, margin
+    onResize()
+    function onResize() {
+        factor = scrollTextElement.clientHeight / textElement.clientHeight
+        margin = textElement.offsetWidth * 0.1
+        setTimeout(function() {
+            Array.from(document.querySelectorAll('svg')).forEach(function(svg) {
+                svg.parentElement.removeChild(svg)
+            })
+            txtjs.renderSVGs()
+            txtjs.mark(txtjs.notes)
+        })
+    }
+    function onResizeend() {
+
+    }
+    function onScroll() {
+        scrollElement.scrollTop = (window.pageYOffset - margin + 16) * factor
+    }
+    txtjs.mark([{id: 'A', position: '417:468', editable: false}])
+}
+
+txtjs.selectNextNote = function(direction) {
+    let selected = txtjs.getSelectedNote()
+    if (!selected) {
+        return
+    }
+    let id = txtjs.getNoteId(selected.elements[0])
+    let ids = txtjs.notes.sort(function(a, b) {
+        return parseInt(a.position.split()[0]) - parseInt(b.position.split()[0])
+    }).map(function(note) {
+        return note.id
+    })
+    txtjs.selectNote(ids[Ox.mod(ids.indexOf(id) + direction, ids.length)])
+}
+
+txtjs.selectNote = function(id) {
+    let selected = txtjs.getSelectedNote()
+    if (selected) {
+        selected.elements.forEach(function(element) {
+            element.classList.remove('selected')
+        })
+    }
+    if (id) {
+        let editing = Array.from(document.querySelectorAll('g.editing'))
+        if (editing.length && txtjs.getNoteId(editing) != id) {
+            editing.forEach(function(element) {
+                element.classList.remove('editing')
+            })
+        }
+        let elements = Array.from(document.querySelectorAll('g.note-' + id))
+        elements.forEach(function(element) {
+            element.classList.add('selected')
+        })
+        // FIXME: SCROLL
+        // elements[0].scrollIntoView()
+        // window.scrollTo(0, elements[0].offsetTop)
+    }
+    txtjs.postMessage('selectNote', {id: id})
+}