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A Guide to CSS Inlining in Email
Email development involves a combination of HTML and CSS, or Cascading Style Sheets. While HTML structures the content and layout of the email, CSS inlining in email is used to style and format the content—like including link colors and headline fonts.
There are three ways to include styles within an email: using external stylesheets, embedded styles, or inline styles. While external stylesheets are a great option for web design, they aren’t the best option for email design—many webmail clients block links to external stylesheets.