mdx_picture: HTML 5.1 for Markdown

Abstract

The HTML <picture> element is a container used to specify multiple <source>s for a specific <img>. The browser will choose the most suitable source according to the current layout of the page and the screen it will be displayed on:

<picture>
	<source srcset="pear-tablet.jpeg" media="(min-width: 1280px)">
	<source srcset="pear-mobile.jpeg" media="(min-width: 720px)">
	<img src="pear-tablet.jpeg" alt="The pear is juicy.">
</picture>

The <picture> was introduced in the HTML 5.1 draft and implemented only in most current browsers Firefox > 38, Chrome > 43. The lack of support of the tag by IE and Safari makes it imposible to use the plain <picture> element. Fortunately there is a plenty of polyfills which enables <picture> element in browsers without its support.

Objective

Implement a markdown extension with a markup for <picture> tag. Attention! The mdx_picture doesn't implement any polyfills, so it supports only browsers with native <picture> tag support. You should add a polyfill implementation by yourself.

Use

The markdown block

[picture]
	[720px]: pear-mobile.jpeg
	[1280px]: pear-tablet.jpeg
	![This picture loads on non-supporting browsers.](image.jpg "The image title")
[/picture]

gets converted to

<picture>
	<source srcset="pear-tablet.jpeg" media="(max-width: 1280px)">
	<source srcset="pear-mobile.jpeg" media="(max-width: 720px)">
	<img alt="This picture loads on non-supporting browsers." src="image.jpg" title="The image title" />
</picture>

Install

• From PyPi pip install mdx_picture
• From Github pip install git+git://github.com/speechkey/mdx_picture

Develop

1. Create new virtual environment e.g. mkvirtualenv mdx_picture
2. Install dependencies by pip install -r requirements.pip

Test

Test pip packet by python setup.py test or run test manually by python -m mdx_picture.tests.