What is causing Gmail to remove my class?

Currently I am developing an email template and have incorporated a CSS class specifically for mobile devices, excluding desktops. However, I have encountered an issue where Gmail on desktop is removing the class entirely.

I'm puzzled as to why this is happening, especially since the class functions properly on other desktop email clients. Any insights on what might be causing this discrepancy?

<style type="text/css">
/* Styling for Smartphone Portrait and Landscape Views */
@media screen and (max-width: 600px) {
  .mobileSpacer { 
    display: block;
  }
}

.mobileSpacer {
  display: none;
}
</style>
htmlcsshtml-email

Answer №1

For compatibility with Gmail desktop, it is important to note that <style> blocks are supported. However, there are certain instances where Gmail does not support <style> blocks, such as when accessed on a mobile browser (Gmail webmail on mobile), through IMAP/POP accounts, or after clicking 'view full email' for a long message.

Gmail may also remove a <style> block if it contains elements it deems incompatible, like certain selectors or formatting errors. To prevent this, use Gmail's own style block and avoid using prohibited elements.

To ensure proper rendering on both mobile and desktop devices, consider implementing a mobile-first approach by styling inline for mobile view and using <style> blocks for desktops. You can then utilize a min-width @media query to adjust layouts accordingly:

@media screen and (min-width: 600px) {
  .mobileSpacer { 
    display: none;
  }
}

Most modern platforms will adhere to these adjustments, with some exceptions including very old desktop/webmail platforms. When targeting Outlook for Windows specifically, include the mso-hide:all property inline within your code:

<td style="mso-hide:all">

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