JavaScript Toggle & Screenshot Extension

Powerful Chrome extension for rendering diagnostics, crawlability, and SEO testing. Explore docs, usage, and architecture.

SEO DiagnosticsJavaScript RenderingFull-page Screenshots

Screenshot Capture

Capture seamless, full-page screenshots with smart element handling and stitching to diagnose rendering, SEO, and visual issues with confidence.

SLONQ Screenshot Capture Workflow

1. Capture Control Functions

At the heart of SLONQ’s system are two authoritative functions:

FunctionPurpose
captureFullPagePowers the complete screenshot workflow, handling all capture, scrolling, and stitching operations
captureFullPageWithChecksAdds critical size validation, ensuring compatibility with Chrome’s storage and SLONQ’s robust standards

These functions orchestrate the entire process, from preparatory steps to final image delivery, ensuring every capture aligns with SLONQ’s exacting quality benchmarks.


2. Element Management: Overcoming Visual and SEO Barriers

Invisible yet impactful, fixed and sticky elements can distort both user and crawler perception. SLONQ’s system deploys:

FunctionPurpose
hideFixedElementsTemporarily hides fixed/sticky elements, removing repeated artifacts from every screenshot section
restoreFixedElementsReliably restores the original state post-capture, ensuring zero disruption to site functionality

By precisely managing DOM elements, SLONQ empowers you to capture a true, unified visual output—reflecting both user and crawler experience.


3. Precision Scrolling & Viewport Capture

Accurate rendering starts with precise navigation. SLONQ’s custom smooth scrolling logic ensures:

  • Pixel-perfect alignment for each captured section
  • Pause-and-capture logic that waits for all dynamic content, images, and fonts to load—mirroring how search engines experience your site

This rigorous approach guarantees that every screenshot reflects the full, interactive lifecycle of your page.


4. Seamless Image Stitching: No Artifacts, No Gaps

SLONQ’s robust image stitching pipeline includes:

StageDescription
Canvas PreparationInitializes an OffscreenCanvas with full page dimensions
Viewport CaptureCaptures each section as the page scrolls, ensuring complete coverage
Image ProcessingConverts sections to high-fidelity ImageBitmap objects
Stitching LogicHandles overlap between sections, preventing artifacts or duplication
ConversionOutputs a unified, optimized image data URL—ready for analysis, sharing, or archiving

This seamless process ensures your team can diagnose even the most elusive rendering issues—delivering actionable insights for SEO and beyond.


5. Intelligent Size Management & Error Recovery

With Chrome’s storage limitations in mind, SLONQ’s system delivers:

  • Automatic size checks: Proactively alerts if a capture exceeds browser constraints
  • Visual feedback: Notifies users at each process stage
  • Fallback solutions: Offers alternative capture methods for oversized pages

Robust error detection—including tab focus monitoring and strategic recovery options—ensures you can trust every capture, every time.


UI Integration: Intuitive, Actionable, SLONQ

SLONQ’s Screenshot Capture is seamlessly integrated into your Chrome extension experience:

UI ElementFunctionality
Screenshot ButtonInstantly initiates a full-page capture
Progress FeedbackDelivers real-time, step-by-step updates during the capture process
Preview & ZoomEnables detailed examination and sharing of captured screenshots
Clear ButtonEfficiently manages local storage, keeping your workflow agile

All interactions are powered by SLONQ’s robust Chrome message-passing framework, guaranteeing immediate feedback and reliable results.

Need help with SEO rendering or SSR migration?

For enterprise audits, platform integration or technical SEO consulting, contact the SLONQ team for a custom solution.