> ## Documentation Index > Fetch the complete documentation index at: https://docs.lettr.com/llms.txt > Use this file to discover all available pages before exploring further. # Email Content Rendering Issues > Diagnose and fix broken layouts, missing images, font fallbacks, and clipped messages across email clients. Email clients render HTML differently — there is no universal standard like there is for web browsers. Layouts that look perfect in Gmail can break completely in Outlook, and vice versa. This guide covers the most common rendering problems and how to fix them. *** ## The Rendering Landscape Each email client uses a different rendering engine, which means different levels of CSS and HTML support: | Client | Rendering Engine | CSS Support | | ----------------------------------- | --------------------------------------------- | ----------------------------------------------------------------------------- | | **Gmail (web)** | Custom (strips `