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+# Area Charts
+
+Both [line](line.md) and [radar](radar.md) charts support a `fill` option on the dataset object which can be used to create area between two datasets or a dataset and a boundary, i.e. the scale `origin`, `start` or `end` (see [filling modes](#filling-modes)).
+
+> **Note:** this feature is implemented by the [`filler` plugin](https://github.com/chartjs/Chart.js/blob/master/src/plugins/plugin.filler.js).
+
+## Filling modes
+
+| Mode | Type | Values |
+| :--- | :--- | :--- |
+| Absolute dataset index <sup>1</sup> | `number` | `1`, `2`, `3`, ... |
+| Relative dataset index <sup>1</sup> | `string` | `'-1'`, `'-2'`, `'+1'`, ... |
+| Boundary <sup>2</sup> | `string` | `'start'`, `'end'`, `'origin'` |
+| Disabled <sup>3</sup> | `boolean` | `false` |
+
+> <sup>1</sup> dataset filling modes have been introduced in version 2.6.0<br>
+> <sup>2</sup> prior version 2.6.0, boundary values was `'zero'`, `'top'`, `'bottom'` (deprecated)<br>
+> <sup>3</sup> for backward compatibility, `fill: true` (default) is equivalent to `fill: 'origin'`<br>
+
+**Example**
+```javascript
+new Chart(ctx, {
+    data: {
+        datasets: [
+            {fill: 'origin'},      // 0: fill to 'origin'
+            {fill: '+2'},          // 1: fill to dataset 3
+            {fill: 1},             // 2: fill to dataset 1
+            {fill: false},         // 3: no fill
+            {fill: '-2'}           // 4: fill to dataset 2
+        ]
+    }
+});
+```
+
+## Configuration
+| Option | Type | Default | Description |
+| :--- | :--- | :--- | :--- |
+| [`plugins.filler.propagate`](#propagate) | `boolean` | `true` | Fill propagation when target is hidden.
+
+### propagate
+`propagate` takes a `boolean` value (default: `true`).
+
+If `true`, the fill area will be recursively extended to the visible target defined by the `fill` value of hidden dataset targets:
+
+**Example**
+```javascript
+new Chart(ctx, {
+    data: {
+        datasets: [
+            {fill: 'origin'},   // 0: fill to 'origin'
+            {fill: '-1'},       // 1: fill to dataset 0
+            {fill: 1},          // 2: fill to dataset 1
+            {fill: false},      // 3: no fill
+            {fill: '-2'}        // 4: fill to dataset 2
+        ]
+    },
+    options: {
+        plugins: {
+            filler: {
+                propagate: true
+            }
+        }
+    }
+});
+```
+
+`propagate: true`:
+- if dataset 2 is hidden, dataset 4 will fill to dataset 1
+- if dataset 2 and 1 are hidden, dataset 4 will fill to `'origin'`
+
+`propagate: false`:
+- if dataset 2 and/or 4 are hidden, dataset 4 will not be filled