The Squarespace Developer Platform is an advanced tool that enables deep site customization beyond standard built-in options. It's specifically designed for users with advanced coding knowledge in HTML, Less CSS, JSON-T, and Github.

Key Features and Capabilities:

• Create custom 7.0 site templates from scratch
• Modify existing 7.0 templates
• Access template markup, stylesheets, scripts, and design resources

Limitations:

• Cannot create or modify 7.1 sites
• No access to CMS content
• Cannot add server-side custom code
• Unable to modify default scripts, styles, or customization tools
• Cannot customize blocks or cover pages

Important Considerations:

When Enabling Developer Mode:

• Demo content will disappear
• Template changes become locked
• No template updates from Squarespace (platform updates continue)
• Current site remains unchanged unless code is modified

When Disabling Developer Mode:

• All custom code and styling disappears
• Site reverts to default settings
• Custom layouts and integrations stop working
• Navigation menus reset
• Custom blog post types revert to defaults
• Sidebar, header, and footer customizations vanish

Plan Requirements:

• Requires Business plan or higher
• Trial sites with developer mode don't expire
• Downgrading to Personal plan restricts further modifications

Authentication:

• Two-factor authentication users need an application password
• Social login users must create an application password

Support:

• Basic platform assistance available
• No custom code troubleshooting support
• Developer community forum available for coding help
• Comprehensive documentation provided at developers.squarespace.com

The Developer Platform is recommended only for experienced developers who can independently troubleshoot code issues. Most users can achieve desired customizations through Squarespace's built-in code injection tools.

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