SparkPost/heml
Heml
Heml is a framework providing a custom markup language and compiler designed to generate responsive HTML and CSS for consistent rendering across email clients. It functions as a system for transforming specialized markup strings into deliverable email templates and associated metadata.
The project features a component system for defining reusable custom elements and style rules to standardize design patterns. It includes a responsive layout engine that converts flexible grid structures, columns, and rows into compatible fixed-width tables and fluid layouts.
The toolset covers email metadata management for subject lines and preview text, validation-aware rendering to capture structural errors, and a development environment with real-time file watching and browser previews.
Features
- Email Markup Renderers - Provides a specialized markup language and renderer to generate responsive HTML and CSS for consistent email client rendering.
- Markup Compilers - Transforms specialized custom markup strings into optimized, email-compatible HTML and CSS during the build process.
- Custom Element Definitions - Implements a system for defining custom elements and tags to create a reusable library of email components.
- Email Component Libraries - Offers modular UI primitives optimized for the constraints of email-safe HTML and CSS.
- Cross-Client Email Rendering - Ensures that custom markup generates HTML and CSS that render consistently across various email service providers.
- Email Design Systems - Provides a standardized collection of modular components to maintain visual consistency in email design.
- Email Frameworks - Ships a framework for building flexible, responsive email layouts with grid structures that scale across different screen widths.
- Column-Based Responsive Grids - Converts flexible column and row definitions into fluid, email-compatible table layouts.
- Responsive Layout Engines - Implements a layout engine that automatically adapts email grid structures to fit various screen sizes.
- Email Templates - Generates responsive HTML email communications from a specialized markup-based system.
- Email - Implements a compiler that transforms custom markup strings into validated, deliverable email HTML and metadata.
- Responsive Email Design - Facilitates the creation of HTML emails that adapt fluidly to different screen sizes and clients.
- Email Header Generation - Extracts metadata from markup to automatically generate email subject lines and preview snippets.
- Real-time Generation Previews - Provides immediate visual feedback in the browser as email markup templates are edited.
- Markup Structural Validation - Captures and reports syntax and structural errors while converting custom markup into final HTML.
- Email Template Previews - Provides local rendering of email templates for instant visual verification during development.
- Inbox Preview Controls - Controls how emails appear in inbox snippets by defining subject and preview text.
- Email Style Frameworks - Provides a system of CSS patterns for controlling colors and spacing across diverse email clients.
