On the appium docs if you search for m the following exception is raised:

Uncaught Error: Syntax error, unrecognized expression: .tocify-item[data-unique=migrating-your-tests-from-appium-0.18.x-to-appium-1.x]

<h1 id="migrating-your-tests-from-appium-0.18.x-to-appium-1.x"><span id="migrating-to-1-0.md"></span>Migrating your tests from Appium 0.18.x to Appium 1.x</h1>

The id generated by slate fails to filter out special characters that interfere with css selectors.