Custom code allows you to enhance your site's functionality and appearance beyond built-in features. Here's what you need to know about implementing custom code effectively.

Types of Supported Code:

• HTML (for adding content and structure)
• CSS (for styling and design, limited to 128,000 characters)
• JavaScript (for interactive features)
• Markdown

Note: Server-side code like PHP, Ruby, and SQL is not supported.

Adding Custom Code:

1. Use Code Blocks for advanced customizations
2. Use Embed Blocks for basic third-party content (uses oEmbed Standard)

CSS Customization Options:

• Fonts
• Colors
• Backgrounds

Avoid using CSS for:

• Padding
• Margins
• Floats
• Size adjustments
• Alignment

Troubleshooting Common Issues:

If code isn't displaying:

• Refresh your browser
• Test in private browsing mode
• Check if the code is in an index page
• Verify Ajax loading settings

If you can't paste code:

• Use keyboard shortcuts
• Check for formatting issues

CORS Errors:

• All requests must come from server-side applications
• JavaScript browser requests may trigger CORS errors

Recommended Learning Resources:

• W3Schools
• Codecademy
• Mozilla Developer Network
• Stack Overflow
• Shay Howe
• SitePoint
• Treehouse

Important Considerations:

• Custom code is an advanced modification
• Acquire coding knowledge before implementation
• Code changes may conflict with built-in features
• Consider hiring a Squarespace Expert if needed
• Test all custom code thoroughly before deployment

Remember: Custom code implementation is outside the scope of standard support. For technical assistance, visit the Squarespace Forum or join Squarespace Circle if you've built three or more active sites.

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