.. This document is auto-generated by the altair-gallery extension. Do not modify directly.

.. _gallery_trail_marker:


Trail Marker
------------
The ``trail`` marker is like the ``line`` marker, but it allows properties of
the line (such as thickness) to vary along the length of the line.
This shows a simple example of the trail mark using stock prices.


.. altair-plot::
    :code-below:

    
    import altair as alt
    from vega_datasets import data

    stocks = data.stocks.url

    alt.Chart(stocks).mark_trail().encode(
        x='date:T',
        y='price:Q',
        size='price:Q',
        color='symbol:N'
    )


.. toctree::
   :hidden: