48 lines
2.5 KiB
Markdown
48 lines
2.5 KiB
Markdown
## Purpose
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Canonical specification for delivery-and-rendering-performance requirements synced from OpenSpec change deltas.
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## Requirements
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### Requirement: HTTP delivery applies compression and cache policy
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The system SHALL apply transport-level compression and explicit cache directives for static assets, API responses, and public HTML routes.
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#### Scenario: Compressed responses are available for eligible payloads
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- **WHEN** a client requests compressible content that exceeds the compression threshold
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- **THEN** the response is served with gzip compression
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- **AND** response headers advertise the selected content encoding
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#### Scenario: Route classes receive deterministic cache-control directives
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- **WHEN** clients request static assets, API responses, or HTML page routes
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- **THEN** each route class returns a cache policy aligned to its freshness requirements
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- **AND** cache directives are explicit and testable from response headers
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### Requirement: Media rendering optimizes perceived loading performance
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The system SHALL lazy-load non-critical images and render shimmer placeholders until image load completion or fallback resolution.
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#### Scenario: Feed and modal images lazy-load with placeholders
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- **WHEN** feed or modal images have not completed loading
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- **THEN** a shimmer placeholder is visible for the pending image region
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- **AND** the placeholder is removed after load or fallback error handling completes
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#### Scenario: Image rendering reduces layout shift risk
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- **WHEN** article images are rendered in hero, feed, or modal contexts
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- **THEN** image elements include explicit dimensions and async decoding hints
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- **AND** layout remains stable while content loads
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### Requirement: Smooth scrolling behavior is consistently enabled
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The system SHALL provide smooth scrolling behavior for in-page navigation and user-initiated scroll interactions.
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#### Scenario: In-page navigation uses smooth scrolling
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- **WHEN** users navigate to in-page anchors or equivalent interactions
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- **THEN** scrolling transitions occur smoothly rather than jumping abruptly
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- **AND** behavior is consistent across supported breakpoints
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### Requirement: Performance thresholds are continuously validated
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The system SHALL enforce page-speed and rendering performance thresholds in automated checks.
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#### Scenario: Performance budget gate
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- **WHEN** performance checks exceed configured budget thresholds
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- **THEN** CI performance gate fails
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- **AND** reports identify the regressed metrics and impacted pages
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