A couple weeks ago, someone in my Twitter timeline retweeted the following tweets from DOM Monster: In HTML5, quotes around attribute values are optional. Which means, omit them. Smaller, faster, less clutter. Here’s an example. This page from GitHub contains about 4,517 quote characters. Most of these can be omitted. https://github.com/rails/rails/commit/3756a3fdfe8d339a53bf347487342f93fd9e1edb T