Content does not automatically center in IE11

I know, why do people still use it, but some insist on maintaining backward compatibility with IE. By default, jsPsych didn’t center the content for me, so I had to add these styles:

  .jspsych-content-wrapper {
    min-height: 100vh;
    min-width: 100vw;
    display: -ms-flexbox;
    -ms-flex-direction: column;
  }

  #jspsych-content {
    -ms-flex-grow: 1
  }

maybe add these by default? They do not appear to be disruptive for other browsers.

[jodeleeuw]

This is great. I made one minor change about mobile browser support to add some clarification. I think it’s good to go!

[becky-gilbert]

I added a draft page called “Browser and Device Support” in the docs-6.2 branch here: https://github.com/jspsych/jsPsych/blob/docs-6.2/docs/overview/browser-device-support.md Please feel free to edit!