Sirv Media Viewer

Sirv Media Viewer (SMV) is the right path when the user needs interactive product media rather than just a transformed image URL. It handles galleries, thumbnails, zoom, spins, video, 3D models, smart galleries, fullscreen, lazy loading, and responsive behavior.

Official Sources First

Check current Sirv docs before changing option names, module names, event/API calls, or CSP rules:

• https://docs.sirv.com/sirv-media-viewer
• https://docs.sirv.com/sirv-media-viewer/core-features/responsive-images
• https://docs.sirv.com/sirv-media-viewer/core-features/smart-gallery
• https://docs.sirv.com/sirv-media-viewer/core-features/accessibility
• https://docs.sirv.com/sirv-media-viewer/advanced-implementation/api
• https://docs.sirv.com/sirv-media-viewer/advanced-implementation/events
• https://docs.sirv.com/sirv-media-viewer/advanced-implementation/content-security-policy-for-sirv

Read [implementation.md](references/implementation.md) when writing or reviewing viewer markup, script loading, options, breakpoints, smart galleries, API/events, or CSP.

For creating the spin assets themselves (frame naming, .spin generation, spin options, video-to-spin), use ../sirv-360-spin/SKILL.md; for video encoding/streaming strategy outside the viewer, ../video-optimization/SKILL.md.

Default Workflow

1. Identify the media set: zoomable images, static images, .spin, video, YouTube/Vimeo, .glb/.gltf, PDF gallery, or .view smart gallery.
2. Choose the viewer shape: single item, explicit child-item gallery, single-div comma-separated gallery, smart .view gallery, grid, or slider.
3. Load Sirv JS once, ideally in the document head for important above-fold viewers. Use a module-limited Sirv JS URL only after checking the current docs and required media modules.
4. Use SMV markup: a class="Sirv" container with child div data-src assets, or a single div class="Sirv" data-src="...">.
5. Put viewer behavior in data-options, SirvOptions.viewer, or data-breakpoints; put image transforms in Sirv Dynamic Imaging URLs/profiles.
6. For above-fold/LCP-relevant viewers, avoid default lazy delays by using autostart:created, preconnect to Sirv domains, and reserve stable layout space.
7. Provide meaningful data-alt or Sirv file descriptions. Keep ARIA labels intentional when customizing a11y prompts.
8. Verify in a real browser: first asset load, thumbnail navigation, fullscreen, zoom, spin drag, video/model controls, mobile behavior, keyboard/focus, network requests, LCP, and CLS.

Core Patterns

Mixed Product Gallery

<link rel="preconnect" href="https://scripts.sirv.com" crossorigin>
<link rel="preconnect" href="https://account.sirv.com" crossorigin>
<script src="https://scripts.sirv.com/sirvjs/v3/sirv.js"></script>

<div class="Sirv" data-options="autostart:created; layout.aspectRatio:1/1; thumbnails.position:bottom">
  <div data-src="https://account.sirv.com/products/sku-123-front.jpg" data-type="zoom" data-alt="SKU 123 front view"></div>
  <div data-src="https://account.sirv.com/products/sku-123-side.jpg" data-type="zoom" data-alt="SKU 123 side view"></div>
  <div data-src="https://account.sirv.com/products/sku-123.spin" data-alt="SKU 123 360 spin"></div>
  <div data-src="https://account.sirv.com/products/sku-123-demo.mp4" data-options="autoplay:false" data-alt="SKU 123 demo video"></div>
</div>

Smart Gallery

<script src="https://scripts.sirv.com/sirvjs/v3/sirv.js"></script>
<div
  class="Sirv"
  data-src="https://account.sirv.com/products/sku-123.view"
  data-options="itemsOrder:spin, zoom, video, model, image; fullscreen.enable:true"
></div>

Single-Div Gallery

<div
  class="Sirv"
  data-src="https://account.sirv.com/products/sku-123.spin, https://account.sirv.com/products/sku-123-front.jpg, https://account.sirv.com/products/sku-123-demo.mp4"
  data-options="layout.type:slider; thumbnails.type:square"
></div>

Option Boundaries

• data-options on the viewer controls all items unless item-level options override it.
• Item-level data-options should be used for one asset's zoom mode, video autoplay, spin hints, or model options.
• SirvOptions.viewer is useful for page/site defaults.
• data-breakpoints is for per-viewer responsive behavior and has higher priority than normal options.
• Use SirvMobileOptions or SMV breakpoints for mobile-specific quality/layout only when the behavior should diverge.

Red Flags

• Hand-building a product gallery/zoom/spin slider when SMV should own the interaction.
• Adding class="Sirv"/data-src markup without the Sirv JS script.
• Loading the full Sirv JS bundle when a documented module-limited script would cover a narrow use case.
• Leaving an above-fold product viewer on default lazy loading when it is the LCP path.
• Not reserving viewer space, causing CLS while thumbnails or first media initialize.
• Missing data-alt and relying on unlabeled media unless Sirv file descriptions are verified.
• Mixing transform concerns into viewer options or gallery behavior into Dynamic Imaging URL params.
• Forgetting CSP allowances for scripts.sirv.com, the account/custom Sirv domain, video.sirv.com, stats.sirv.com, blob:, data:, and the inline/eval requirements documented by Sirv.

Verification

• Sirv JS is loaded once and before the viewer needs to initialize.
• Every SMV data-src URL returns 200 and is the intended media type.
• The first visible viewer requests media early enough for LCP; lower-page viewers remain lazy.
• Viewer space is stable before media loads; CLS is not introduced.
• Thumbnails, arrows, fullscreen, zoom, spin, video, model, and smart gallery ordering work at desktop and mobile breakpoints.
• data-alt or Sirv file descriptions produce useful alt/ARIA output.
• API/event code uses documented calls such as Sirv.getInstance(...), Sirv.viewer.getInstance(...), Sirv.on(...), or DOM sirv:* events.
• CSP is adjusted when a strict policy blocks scripts, images, media, stats, frames, blobs, or inline styles required by Sirv.