"The latest data from Mixpanel shows that approximately 32.22% of active iPhone users still have a 4-inch screen. That is the same screen size as the so-called "iPhone 5se" that Apple is expected to announce at its rumored March 15 event."
"Chrome 49 is getting full support for CSS variables so developers will able to define a variable to be used throughout their code and can be changed in realtime — and doesn’t require any additional compiling."
"“Inlining” styles moves the CSS and associated formatting instructions from the style block in the of your email into the body of the HTML. Thanks to unwieldy email clients, like Gmail (one of the most popular email clients, representing 15% of email opens worldwide), inlining styles in email is a necessity."