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diff --git a/src/dumbymap.mjs b/src/dumbymap.mjs
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+// vim:foldmethod
+import MarkdownIt from 'markdown-it'
+import MarkdownItAnchor from 'markdown-it-anchor'
+import MarkdownItFootnote from 'markdown-it-footnote'
+import MarkdownItFrontMatter from 'markdown-it-front-matter'
+import MarkdownItTocDoneRight from 'markdown-it-toc-done-right'
+import LeaderLine from 'leader-line'
+import PlainDraggable from 'plain-draggable'
+import { render, parseConfigsFromText } from 'mapclay'
+
+const observers = new Map()
+
+export const markdown2HTML = async (container, mdContent) => {
+  // Render: Markdown -> HTML {{{
+
+  container.innerHTML = `
+    <div id="map"></div>
+    <div id="markdown"></div>
+  `
+
+  const md = MarkdownIt({ html: true })
+    .use(MarkdownItAnchor, {
+      permalink: MarkdownItAnchor.permalink.linkInsideHeader({ placement: 'before' })
+    })
+    .use(MarkdownItFootnote)
+    .use(MarkdownItFrontMatter)
+    .use(MarkdownItTocDoneRight)
+
+  // FIXME A better way to generate draggable code block
+  md.renderer.rules.draggable_block_open = () => '<div>'
+  md.renderer.rules.draggable_block_close = () => '</div>'
+
+  md.core.ruler.before('block', 'draggable_block', (state) => {
+    state.tokens.push(new state.Token('draggable_block_open', '', 1))
+  })
+
+  // Add close tag for block with more than 2 empty lines
+  md.block.ruler.before('table', 'draggable_block', (state, startLine) => {
+    if (state.src[state.bMarks[startLine - 1]] === '\n' && state.src[state.bMarks[startLine - 2]] === '\n') {
+      state.push('draggable_block_close', '', -1);
+      state.push('draggable_block_open', '', 1);
+    }
+  })
+
+  md.core.ruler.after('block', 'draggable_block', (state) => {
+    state.tokens.push(new state.Token('draggable_block_close', '', -1))
+  })
+
+  const markdown = container.querySelector('#markdown')
+  const contentWithToc = '${toc}\n\n\n' + mdContent
+  markdown.innerHTML = md.render(contentWithToc);
+  markdown.querySelectorAll('*> div:not(:has(nav))')
+    .forEach(b => b.classList.add('draggable-block'))
+
+
+  // TODO Improve it!
+  const docLinks = Array.from(container.querySelectorAll('#markdown a[href^="#"][title^="doc"]'))
+  docLinks.forEach(link => {
+    link.classList.add('with-leader-line', 'doclink')
+    link.lines = []
+
+    link.onmouseover = () => {
+      const target = document.querySelector(link.getAttribute('href'))
+      if (!target?.checkVisibility()) return
+
+      const line = new LeaderLine({
+        start: link,
+        end: target,
+        hide: true,
+        path: "magnet"
+      })
+      link.lines.push(line)
+      line.show('draw', { duration: 300, })
+    }
+    link.onmouseout = () => {
+      link.lines.forEach(line => line.remove())
+      link.lines.length = 0
+    }
+  })
+  //}}}
+}
+
+export const generateMaps = async (container) => {
+  // LeaderLine {{{
+
+  // Get anchors with "geo:" scheme
+  const markdown = container.querySelector('#markdown')
+  markdown.anchors = []
+
+  // Set focusArea
+  const focusArea = container.querySelector('#map')
+  const mapPlaceholder = document.createElement('div')
+  mapPlaceholder.id = 'mapPlaceholder'
+  focusArea.appendChild(mapPlaceholder)
+
+  // Links points to map by geo schema and id
+  const geoLinks = Array.from(container.querySelectorAll('#markdown a[href^="geo:"]'))
+    .filter(link => {
+      const url = new URL(link.href)
+      const xy = url?.href?.match(/^geo:([0-9.,]+)/)?.at(1)?.split(',')?.reverse()?.map(Number)
+
+      if (!xy || isNaN(xy[0]) || isNaN(xy[1])) return false
+
+      // Geo information in link
+      link.url = url
+      link.xy = xy
+      link.classList.add('with-leader-line', 'geolink')
+      link.targets = link.url.searchParams.get('id')?.split(',') ?? null
+
+      // LeaderLine
+      link.lines = []
+      link.onmouseover = () => addLeaderLines(link)
+      link.onmouseout = () => removeLeaderLines(link)
+      link.onclick = (event) => {
+        event.preventDefault()
+        markdown.anchors
+          .filter(isAnchorPointedBy(link))
+          .forEach(updateMapByMarker(xy))
+        // TODO Just hide leader line and show it again
+        removeLeaderLines(link)
+      }
+
+      return true
+    })
+
+  const isAnchorPointedBy = (link) => (anchor) => {
+    const mapContainer = anchor.closest('.map-container')
+    const isTarget = !link.targets || link.targets.includes(mapContainer.id)
+    return anchor.title === link.url.pathname && isTarget
+  }
+
+  const isAnchorVisible = (anchor) => {
+    const mapContainer = anchor.closest('.map-container')
+    return insideWindow(anchor) && insideParent(anchor, mapContainer)
+  }
+
+  const drawLeaderLine = (link) => (anchor) => {
+    const line = new LeaderLine({
+      start: link,
+      end: anchor,
+      hide: true,
+      middleLabel: link.url.searchParams.get('text'),
+      path: "magnet",
+    })
+    line.show('draw', { duration: 300, })
+    return line
+  }
+
+  const addLeaderLines = (link) => {
+    link.lines = markdown.anchors
+      .filter(isAnchorPointedBy(link))
+      .filter(isAnchorVisible)
+      .map(drawLeaderLine(link))
+  }
+
+  const removeLeaderLines = (link) => {
+    if (!link.lines) return
+    link.lines.forEach(line => line.remove())
+    link.lines = []
+  }
+
+  const updateMapByMarker = (xy) => (marker) => {
+    const renderer = marker.closest('.map-container')?.renderer
+    renderer.updateCamera({ center: xy }, true)
+  }
+
+  const insideWindow = (element) => {
+    const rect = element.getBoundingClientRect()
+    return rect.left > 0 &&
+      rect.right < window.innerWidth + rect.width &&
+      rect.top > 0 &&
+      rect.bottom < window.innerHeight + rect.height
+  }
+
+  const insideParent = (childElement, parentElement) => {
+    const childRect = childElement.getBoundingClientRect();
+    const parentRect = parentElement.getBoundingClientRect();
+    const offset = 20
+
+    return childRect.left > parentRect.left + offset &&
+      childRect.right < parentRect.right - offset &&
+      childRect.top > parentRect.top + offset &&
+      childRect.bottom < parentRect.bottom - offset
+  }
+  //}}}
+  // Render Maps {{{
+
+  const afterEachMapLoaded = (mapContainer) => {
+    mapContainer.querySelectorAll('.marker')
+      .forEach(marker => markdown.anchors.push(marker))
+
+    const focusClickedMap = () => {
+      if (container.getAttribute('data-layout') !== 'none') return
+
+      container.querySelectorAll('.map-container')
+        .forEach(c => c.classList.remove('focus'))
+      mapContainer.classList.add('focus')
+    }
+    mapContainer.onclick = focusClickedMap
+  }
+
+  // Set unique ID for map container
+  const mapIdList = []
+  const assignMapId = (config) => {
+    let mapId = config.id
+    if (!mapId) {
+      mapId = config.use?.split('/')?.at(-1)
+      let counter = 2
+      while (mapIdList.includes(mapId)) {
+        mapId = `${config.use}.${counter}`
+        counter++
+      }
+      config.id = mapId
+    }
+    mapIdList.push(mapId)
+  }
+
+  const markerOptions = geoLinks.map(link => {
+    return {
+      targets: link.targets,
+      xy: link.xy,
+      title: link.url.pathname
+    }
+  })
+
+
+  // Render each code block with "language-map" class
+  const renderTargets = Array.from(container.querySelectorAll('pre:has(.language-map)'))
+  const renderAllTargets = renderTargets.map(async (target) => {
+    // Get text in code block starts with '```map'
+    // BE CAREFUL!!! 0xa0 char is "non-breaking spaces" in HTML text content
+    // replace it by normal space
+    const configText = target.querySelector('.language-map').textContent.replace(/\u00A0/g, '\u0020')
+
+    let configList = []
+    try {
+      configList = parseConfigsFromText(configText).map(result => {
+        assignMapId(result)
+        const markersFromLinks = markerOptions.filter(marker =>
+          !marker.targets || marker.targets.includes(result.id)
+        )
+        Object.assign(result, { markers: markersFromLinks })
+        return result
+      })
+    } catch (err) {
+      console.error('Fail to parse yaml config for element', target, err)
+    }
+
+    // Render maps
+    return render(target, configList)
+      .then(results => {
+        results.forEach((mapByConfig) => {
+          if (mapByConfig.status === 'fulfilled') {
+            afterEachMapLoaded(mapByConfig.value)
+            return mapByConfig.value
+          } else {
+            console.error('Fail to render target element', mapByConfig.value)
+          }
+        })
+      })
+  })
+  const renderInfo = await Promise.all(renderAllTargets).then(() => 'Finish Rendering')
+  console.info(renderInfo)
+
+  //}}}
+  // CSS observer {{{
+  if (!observers.get(container)) {
+    observers.set(container, [])
+  }
+  const obs = observers.get(container)
+  if (obs.length) {
+    obs.forEach(o => o.disconnect())
+    obs.length = 0
+  }
+  // Layout{{{
+
+  // press key to switch layout
+  const layouts = ['none', 'side', 'overlay']
+  container.setAttribute("data-layout", layouts[0])
+  document.onkeydown = (event) => {
+    if (event.key === 'x' && container.querySelector('.map-container')) {
+      let currentLayout = container.getAttribute('data-layout')
+      currentLayout = currentLayout ? currentLayout : 'none'
+      const nextLayout = layouts[(layouts.indexOf(currentLayout) + 1) % layouts.length]
+
+      container.setAttribute("data-layout", nextLayout)
+    }
+  }
+
+  // Add draggable part for blocks
+  markdown.blocks = Array.from(markdown.querySelectorAll('.draggable-block'))
+  markdown.blocks.forEach(block => {
+    const draggablePart = document.createElement('div');
+    draggablePart.classList.add('draggable')
+    draggablePart.textContent = '☰'
+
+    // TODO Better way to close block
+    draggablePart.onmouseup = (e) => {
+      if (e.button === 1) block.style.display = "none";
+    }
+    block.insertBefore(draggablePart, block.firstChild)
+  })
+
+  // observe layout change
+  const layoutObserver = new MutationObserver(() => {
+    const layout = container.getAttribute('data-layout')
+    markdown.blocks.forEach(b => b.style.display = "block")
+
+    if (layout === 'none') {
+      mapPlaceholder.innerHTML = ""
+      const map = focusArea.querySelector('.map-container')
+      // Swap focused map and palceholder in markdown
+      if (map) {
+        mapPlaceholder.parentElement?.replaceChild(map, mapPlaceholder)
+        focusArea.append(mapPlaceholder)
+      }
+    } else {
+      // If paceholder is not set, create one and put map into focusArea
+      if (focusArea.contains(mapPlaceholder)) {
+        const mapContainer = container.querySelector('.map-container.focus') ?? container.querySelector('.map-container')
+        mapPlaceholder.innerHTML = `<div>Placeholder</div>`
+        // TODO
+        // mapPlaceholder.src = map.map.getCanvas().toDataURL()
+        mapContainer.parentElement?.replaceChild(mapPlaceholder, mapContainer)
+        focusArea.appendChild(mapContainer)
+      }
+    }
+
+    if (layout === 'overlay') {
+      markdown.blocks.forEach(block => {
+        block.draggableInstance = new PlainDraggable(block, { handle: block.querySelector('.draggable') })
+        block.draggableInstance.snap = { x: { step: 20 }, y: { step: 20 } }
+        // block.draggableInstance.onDragEnd = () => {
+        //   links(block).forEach(link => link.line.position())
+        // }
+      })
+    } else {
+      markdown.blocks.forEach(block => {
+        try {
+          block.style.transform = 'none'
+          block.draggableInstance.remove()
+        } catch (err) {
+          console.warn('Fail to remove draggable instance', err)
+        }
+      })
+    }
+  });
+  layoutObserver.observe(container, {
+    attributes: true,
+    attributeFilter: ["data-layout"],
+    attributeOldValue: true
+  });
+  obs.push(layoutObserver)
+  //}}}
+  //}}}
+  return container
+}