# A Line chart with a highlighted section

Here we have an example of a dark-themed `SVG` Line chart that has a section of it highlighted. The standard Line is a filled Line object that does NOT use the `filledAccumulative` option - it uses transparency in the colors instead so that you can see datasets at the back of other datasets.

The thing that differentiates this demo is the fact that once rendered there are two rectangles placed over the chart - one on the left-hand-side and one on the right-hand-side. This leaves a section in the middle of those two rectangles, that has a highlighted appearance.

As it is on this chart, the section that's highlighted has no real meaning - but this doesn't have to be the case and it could highlight certain entries or a range on the chart (for example, it could be a horizontal highlight rectangle).

The `responsive` function simply changes the `SVG` tag from being floated right to not having any `float` at all.

Because adding the `responsive` function means that the chart is redrawn whenever the window size changes (ie when you resize the browser) the two covers are drawn in the `draw` event and the nodes are assigned to global variables. These coverings are removed before the chart is redrawn so they don't accumulate on top of each other.

This goes in the documents header:

    <script src="RGraph.svg.common.core.js"></script>
    <script src="RGraph.svg.common.key.js"></script>
    <script src="RGraph.svg.line.js"></script>

Put this where you want the chart to show up:

    <div style="float: right">
        <div style="width: 450px; height: 200px; display: inline-block; background-color: black" id="cc"></div>
    </div>

This is the code that generates the chart - it should be placed AFTER the `div` tag: