What impact does the use of CSS in emails have on various email clients and reading formats?

As I delve into customizing my very first (woocommerce) email template, I am considering the option of concealing data using CSS display: none.

However, a few questions arise regarding the compatibility and support of CSS and display: none:

  1. Do all email clients have the capability to interpret basic CSS like display: none, or is this pushing it too far?
  2. In cases where recipients view emails solely in text format (non-HTML), does the email client convert the HTML content to plain text, rendering the display: none invisible, or will the email client display any available plain text from the HTML without conversion, possibly revealing the display: none content?
  3. Is there a reliable platform for testing how emails appear across various email clients such as Outlook, Gmail, Yahoo, Spark, and Mac?

I understand these are somewhat elementary inquiries, but any assistance would be greatly appreciated!

Thank you very much.

Update:

This link offers insights on hiding elements:

Currently, I am implementing the following techniques in an attempt to conceal content across multiple email clients:

font-size: 0; /* in case display-none isn't effective */
max-height: 0px; overflow: hidden; /* optimized for Gmail */
opacity: 0;
visibility: hidden;
display: none; 
mso-hide: all; /* tailored for Outlook */
htmlcssemailhtml-email

Answer №1

  1. For a comprehensive guide on how different email clients support display:none, check out the insights provided by Can I Email. It's an excellent resource maintained by yours truly! (Disclaimer: I'm the maintainer of the site.)

  1. When sending emails, remember that HTML and plain text versions are crucial. Ensure you create and send both versions to cater to all recipients. By default, WooCommerce with the Storefront theme only sends text/html. To enable multi-part emails, navigate to WooCommerce > Settings > Emails, select an email, and change the "Email type" value to Multi-part. You can then customize the plain text version in your theme from the admin panel.

  2. To test your email designs effectively, consider using tools like Litmus, Email on Acid, or Testi.at. These tools offer reliable screenshot testing capabilities and are valuable assets for anyone working within the email community.

Answer №2

  1. In the realm of email design, the display: none property functions effectively on Gmail since 2016, but faces limitations in Outlook.

  2. If an email client does not recognize this property, it will simply ignore it and display the content inside.

  3. To ensure your emails are rendering correctly across various email services, it is advisable to test them by creating accounts on different platforms and sending test emails to yourself. Many minor email services tend to follow similar rules as the major ones. Additionally, there are tools available to assist you in testing, which can be found here.

For more tips on crafting HTML emails, check out resources here and here.

Answer №3

Using the CSS property display none is effective across most email clients, although Outlook can be a bit tricky. Here's a snippet of code we utilize to conceal preheaders.

<div style="display:none;font-size:1px;color:#000000;line-height:1px;max-height:0px;max-width:0px;opacity:0;overflow:hidden;mso-hide:all;">
<!-- pre header -->
 </div>

There are various versions of this technique available online, but the key elements to focus on are display:none and mso-hide:all. The mso-hide:all property is specifically tailored for Outlook and will successfully hide any element it is applied to. Just keep in mind, if you're using nested tables, the code should be added to each one.

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