Sirv Media Viewer

About

Sirv Media Viewer is a beautiful viewer for images, videos and 360 spins. It intelligently resizes assets to suit each users screen and lazy loads them from Sirv's CDN. Thumbnails are autogenerated and all options are highly customizable. Use it to serve one or multiple assets.

Example with zoomable images, 360 spin and video:

Usage

It's easy to embed Sirv Media Viewer in your page.

1. Copy and paste this script anywhere in your HTML, usually before the </head> or the </body>:

<script src="https://scripts.sirv.com/sirvjs/v3/sirv.js"></script>

2. Add a div with class of "Sirv", containing more divs for each of your assets. This example contains one spin, one zoomable image and one video:

<div class="Sirv">
  <div data-src="https://demo.sirv.com/example.spin"></div>
  <div data-src="https://demo.sirv.com/image.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/video.mp4"></div>
</div>

Options

Adjust the experience with over 30 options, plus zoom, spin, video and responsive image options.

Applying options

Options can be applied to each image individually (div) or to all instances on the page (script).

Options in a div

Use the data-options tag to apply options in the relevant div. There is a containing div for the viewer, then a div for each asset (image, video or spin):

<div class="Sirv" data-options="fullscreen.enable:false;">
  <div data-src="https://demo.sirv.com/example.spin" data-options="inactivity:7000;"></div>
  <div data-src="https://demo.sirv.com/image.jpg" data-type="zoom" data-options="mode:right;"></div>
  <div data-src="https://demo.sirv.com/video.mp4" data-options="autoplay:true;"></div>
</div>

Options in a script

To apply options to every instance in your page or site, use a script, for example:

<script>
  var SirvOptions = {
    viewer: {
      spin: {
        inactivity: 7000,
      },
      zoom: {
        mode: 'right',
      },
      video: {
        autoplay: true,
      }
    }
  }
</script>

Quality

Images in Sirv Media Viewer use the following quality by default:

• quality - 80% for standard images
• hdQuality - 60% for hi-res images (retina screens)

Adjust the image quality with the quality and hdQuality parameters. For example, raise the quality to 90% and 80% like so:

<script>
var SirvOptions = {
  viewer: {
    quality: 90,
    hdQuality: 80,
  }
}
</script>

Or set it inline, like so:

<div class="Sirv" data-options="quality:90; hdQuality:80">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div>
  etc.
</div>

Threshold

Images are lazy-loaded, meaning that they only load if and when they come into view. You can load them slightly earlier, when they reach a certain distance from the viewport, by setting threshold to a value. This will load the images 200px before they enter the viewport:

<div class="Sirv" data-options="threshold:200">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    threshold: 200
  }
}
</script>

Arrows

Arrows appear to the left and right, to move to the next/previous image. They can be disabled by setting the arrows parameter to false:

The code looks like this:

<div class="Sirv" data-options="arrows:false">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    arrows: false
  }
}
</script>

Orientation

Arrows appear left and right by default. Instead, they can be shown top and bottom, by setting orientation to vertical:

The code looks like this:

<div class="Sirv" data-options="orientation:vertical">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    orientation: 'vertical'
  }
}
</script>

Loop

The slider will continue to the first image after showing the last image. This can be stopped by setting the loop parameter to false:

The code looks like this:

<div class="Sirv" data-options="loop:false">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    loop: false
  }
}
</script>

Autostart

The images lazy load by default, when they enter the viewport. This avoids unnecessary data transfer, loading images further down the page that aren't needed.

• visible - images lazy load when they enter the viewport.
• created - images load immediately (on page load or upon API creation).
• off - images don't load until you start them with the API.

<div class="Sirv" data-options="autostart:off">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    autostart: 'off'
  }
}
</script>

Thumbnails

Thumbnails under the gallery allow swapping between assets.

Thumbnail layout

The layout can be changed by setting thumbnails.type to any of these options:

• square - Square thumbnails
• auto - Original aspect ratio thumbnails
• bullets - Bulleted dots
• grid - Wrapped rows of thumbnails

The code looks like this:

<div class="Sirv" data-options="thumbnails.type:bullets">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    thumbnails: {
      type: 'bullets'
    }
  }
}
</script>

Thumbnail position

Thumbnails are shown underneath by default. They can be moved to the left, right or top with the thumbnails.position parameter:

<div class="Sirv" data-options="thumbnails.position:left">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg" data-type="zoom"></div> 
  <div data-src="https://demo.sirv.com/demo/apt/04.jpg" data-type="zoom"></div> 
  <div data-src="https://demo.sirv.com/demo/apt/05.jpg" data-type="zoom"></div> 
  <div data-src="https://demo.sirv.com/demo/apt/06.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    thumbnails: {
      position: 'left'
    }
  }
}
</script>

Thumbnails are sized automatically. Instead, you can set a size in px with the thumbnails.size parameter. This will set thumbnails with 110px height:

<div class="Sirv" data-options="thumbnails.size:110">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-type="zoom"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg" data-type="zoom"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    thumbnails: {
      size: 110
    }
  }
}
</script>

Disable thumbnails

Thumbnails can be removed by setting thumbnails.enable to false:

<div class="Sirv" data-options="thumbnails.enable:false">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    thumbnails: {
      enable: false
    }
  }
}
</script>

Pinned thumbnails

Important thumbnails can be pinned to the beginning or end of the carousel, so they don't scroll with the other thumbnails. The first thumbnail below has been pinned:

Add the attribute data-pinned="start" or data-pinned="end" to pin an item.

Example:

<div class="Sirv">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg" data-pinned="start"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/04.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/05.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/06.jpg"></div>
</div>

Custom thumbnails

You can show a completely different thumbnail of your choice. There are many possible uses, for example:

• Show a different image thumb to the main image
• Show text instead of image thumbs
• Show fewer thumbnails and open extras in fullscreen
• Show an extra thumbnail that links to another part of the page
• See working examples

Replace thumbnail with image

To replace a thumbnail with another image, add the tag smv-thumbnail after the item, with an img:

<div data-src="https://your-account.sirv.com/products/product.spin">
  <smv-thumbnail>
    <img data-src="https://your-account.sirv.com/thumbnail-of-your-choice.jpg" alt="Descriptive text here">
  </smv-thumbnail>
</div>

Replace thumbnail with text

To replace a thumbnail, add the tag smv-thumbnail after the item. The example below would replace the image thumbnail with the text "Spin":

<div data-src="https://your-account.sirv.com/products/product.spin">
  <smv-thumbnail>
    <span>Spin</span>
  </smv-thumbnail>
</div>

The example below replaces the 3 image thumbnails with text Spin, Zoom and Video:

The code looks like this:

<style>
  .sirv-text-thumbnails smv-thumbnail[data-type="html"] {
    width: auto !important;
    height: auto !important;
    border: 0 !important;
    text-transform: uppercase;
	padding: 18px 36px;
	font-size: 18pt;
  }
  .sirv-text-thumbnails .smv-item.smv-active smv-thumbnail[data-type="html"] {
    font-weight: bold;
  }
</style>
<div class="Sirv sirv-text-thumbnails">
  <div data-src="https://demo.sirv.com/demo/snug/teal.spin">
    <smv-thumbnail>
      <span>Spin</span>
    </smv-thumbnail>
  </div>
  <div data-src="https://demo.sirv.com/demo/snug/unpacked.jpg" data-type="zoom">
    <smv-thumbnail>
      <span>Zoom</span>
    </smv-thumbnail>
  </div>
  <div data-src="https://demo.sirv.com/demo/snug/sofa-build.mp4">
    <smv-thumbnail>
      <span>Video</span>
    </smv-thumbnail>
  </div>
</div>

Thumbnail events

You can create your own behavior by handling the click on a custom thumbnail. Add an event listener to the thumbnailClick event.

Example:

Sirv.on('viewer:thumbnailClick', function (item) {
  if (item.thumbnail.dataset.customAction === 'enterFullscreen') {
    item.parent().fullscreen();
  }
});

Slider

Adjust how the main image animates between slides.

Slide animation

This animation style can be set to slide.animation.type to fade, slide or off. Off changes the image instantly:

<div class="Sirv" data-options="slide.animation.type:slide">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    slide: {
      animation: {
        type: 'slide'
      }
    }
  }
}
</script>

The animation speed can be changed by adjusting slide.animation.duration:

<div class="Sirv" data-options="slide.animation.duration:500">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    slide: {
      animation: {
        duration: 500
      }
    }
  }
}
</script>

Slide autoplay

The slider can automatically move from one image to the next. Set slide.autoplay to true:

Disable the thumbnails with thumbnails.enable:false and it becomes a slideshow:

Adjust the time each slide shows by setting slide.delay to a longer or shorter duration:

<div class="Sirv" data-options="thumbnails.enable:false; slide.autoplay:true; slide.delay:2000">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    thumbnails: {
      enable: false
    },
    slide: {
      autoplay: true,
      delay: 2000
    }
  }
}
</script>

First slide

Change the first image to be shown. It is 0 by default (for the first image). Change slide.first to another value:

<div class="Sirv" data-options="slide.first:2">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    slide: {
      first: 2
    }
  }
}
</script>

Preload slides

The slides will preload, so that there is no delay in showing other images. You can disable this by setting slide.preload to false:

<div class="Sirv" data-options="slide.preload:false">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div> 
</div>

<script>
var SirvOptions = {
  viewer: {
    slide: {
      preload: false
    }
  }
}
</script>

Click to open URL

It's possible to link to a URL on click of an image in the slider.

Wrap an <a> tag around the <img> tag, like so:

<div class="Sirv" data-options="slide.animation.type:slide">
  <div><a href="https://example.com/"><img data-src="https://demo.sirv.com/demo/apt/01.jpg"></a></div>
  <div><a href="https://example.com/" target="_blank" rel="noopener noreferrer"><img data-src="https://demo.sirv.com/demo/apt/02.jpg"></a></div>
  <div><a href="https://example.com/" target="_blank" rel="noopener noreferrer"><img data-src="https://demo.sirv.com/demo/apt/03.jpg"></a></div>
</div>

Fullscreen

A fullscreen icon in the top right permits big, detailed images.

Instant fullscreen

To instantly launch fullscreen on click, set fullscreen.always to true:

<div class="Sirv" data-options="fullscreen.always:true">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen: {
      always: true
    }
  }
}
</script>

Fullscreen size

There are two types of fullscreen:

• Viewport - within the browser window.
• Native - the entire screen.

The viewport is used by default. To use native fullscreen, set fullscreen.native to true:

<div class="Sirv" data-options="fullscreen.native:true">
  <div data-src="https://demo.sirv.com/demo/snug/pink-shadow.jpg" data-type="zoom"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen: {
      native: true
    }
  }
}
</script>

Disable fullscreen

To disable fullscreen and hide the button, set fullscreen.enable to false:

<div class="Sirv" data-options="fullscreen.enable:false">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen: {
      enable: false
    }
  }
}
</script>

Fullscreen thumbnails

Thumbnails in fullscreen will be automatically sized. Instead, you can set a specific size in px with the fullscreen.thumbnails.size parameter. This will set 150px:

<div class="Sirv" data-options="fullscreen.thumbnails.size:150">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen: {
      thumbnails: {
        size: 150
      }
    }
  }
}
</script>

Thumbnails are shown to the bottom by default. Instead, they can be shown to the top, left or right with the fullscreen.thumbnails.position parameter:

<div class="Sirv" data-options="fullscreen.thumbnails.position:left">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen: {
      thumbnails: {
        position: 'left'
      }
    }
  }
}
</script>

Fullscreen thumbnails are square by default. You can change the style by setting fullscreen.thumbnails.type to any of these options:

• square - Square thumbnails
• auto - Original aspect ratio thumbnails
• bullets - Bulleted dots

<div class="Sirv" data-options="fullscreen.thumbnails.type:left">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen: {
      thumbnails: {
        type: 'left'
      }
    }
  }
}
</script>

To hide the thumbnails until the user moves their mouse down, set fullscreen.thumbnails.autohide to true:

<div class="Sirv" data-options="fullscreen.thumbnails.autohide:true">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/02.jpg"></div>
  <div data-src="https://demo.sirv.com/demo/apt/03.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen:{
      thumbnails: {
        autohide: true
      }
    }
  }
}
</script>

To remove thumbnails from fullscreen view, set fullscreen.thumbnails.enable to false:

<div class="Sirv" data-options="fullscreen.thumbnails.enable:false">
  <div data-src="https://demo.sirv.com/demo/apt/01.jpg"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    fullscreen:{
      thumbnails:{
        enable: false
      }
    }
  }
}
</script>

Fullscreen icon

A variety of fullscreen icons are available:

The icons are numbered from 01 to 18. Apply one of the icons by adding some CSS to your web page, like so:

<style>
.smv-button-fullscreen-open .smv-icon {
  -webkit-mask-image: url(https://scripts.sirv.com/sirvjs/v3/graphics/buttons/fullscreen.07.svg) !important;
  background-color: #4aafe3;
}
</style>

Change the color of the icon with the background-color attribute.

The quickest way to adjust fullscreen icon is in the CSS > Fullscreen section of the Sirv Media Viewer interactive demo.

Alternatively, you could design your own square SVG (or PNG) icon and apply it with CSS, like so:

<style>
.smv-button-fullscreen-open .smv-icon {
  -webkit-mask-image: url(https://your-account.sirv.com/icons/your-new-icon.svg) !important;
}
</style>

Context menu

The right-click context menu is disabled by default. Enable it by setting contextmenu.enable tag to true:

<div class="Sirv" data-options="contextmenu.enable:true;">
  <div data-src="https://demo.sirv.com/example.spin"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    contextmenu: {
      enable: true
    }
  }
}
</script>

To change any text in the context menu, apply these parameters:

• contextmenu.text.zoom.in - text for zooming in
• contextmenu.text.zoom.out - text for zooming out
• contextmenu.text.fullscreen.enter - text for going into fullscreen
• contextmenu.text.fullscreen.exit - text for leaving fullscreen
• contextmenu.text.download - text for downloading the image

  <div class="Sirv" data-options="contextmenu.enable:true; contextmenu.text.zoom.in:Click here to zoom">
  <div data-src="https://demo.sirv.com/example.spin"></div>
</div>

<script>
var SirvOptions = {
  viewer: {
    contextmenu: {
      enable: true,
      text: {
        zoom: {
          in: 'Click here to zoom'
        }
      }
    }
  }
}
</script>

Mobile settings

To set different settings for mobile devices, use one of three ways to apply options. The examples below change the spin hint message to "Tap then drag".

Use a script to apply the settings to all instances on a page:

<script>
var SirvMobileOptions = {
  viewer: {
    spin: {
      hint: {
        message: {
          text: 'Tap then drag'
        }
      }
    }
  }
}
</script>

Alternatively, apply inline settings to Sirv Media Viewer:

<div data-src="https://demo.sirv.com/example.spin" class="Sirv" data-mobile-options="spin.hint.message.text: Tap then drag"></div>

Or apply inline settings to a specific item inside the viewer:

<div class="Sirv">
  <div data-src="https://demo.sirv.com/example.spin" data-mobile-options="hint.message.text: Tap then drag"></div>
</div>

Additional attributes

The data-id attribute can be used to set a unique item name. The name can then be used to control the item via the API. For example this sets an id of my-item to the second image:

<div class="Sirv">
    <div data-src="https://demo.sirv.com/ian.jpg"></div>
    <div data-src="https://demo.sirv.com/jump.jpg" data-id="my-item"></div>
    <div data-src="https://demo.sirv.com/kitesurf.jpg"></div>
</div>

Then controlled va the API:

Sirv.on('viewer:ready', (viewer) => {
    let myslide = viewer.child('my-item');
});

The data-disabled attribute can exclude an item from the viewer. Disabled items can be included again via the API. Disabled items are not initilialized until enabled. For example:

<div class="Sirv" id="my-viewer">
    <div data-src="https://demo.sirv.com/ian.jpg"></div>
    <div data-src="https://demo.sirv.com/jump.jpg" data-id="my-item" data-disabled></div>
    <div data-src="https://demo.sirv.com/kitesurf.jpg"></div>
</div>

Then enabled by the API:

Sirv.viewer.getInstance('#my-viewer').enableItem('my-item');

Custom styling

You can modify Sirv Media Viewer's appearance by adjusting the CSS styles.

Use the Sirv Media Viewer interactive demo to choose your styles. It is the quickest way to generate the CSS code you require. Most of the popular styles can be configured there.

If you'd like to customize something not in the demo, your developer can identify which style to change or you can ask the Sirv support team for help.

Arrow styles

Arrow size, color, opacity and background can be changed with the following styles:

<style>
  .smv-h .smv-arrow .smv-icon {
    background-color: #FFF203;
    opacity: 0.55;
  }
  .smv-arrow-control .smv-arrow {
    background: rgba(251, 255, 123, 0.19) !important;
    height: 100px;
  }
</style>

The quickest way to adjust the arrow style is in the CSS > Arrows section of the Sirv Media Viewer interactive demo.

Style different viewers on same page

If you have multiple instances of Sirv Media Viewer on one page, they will all inherit the same CSS styles.

Normally you'd want all galleries to be styled in the same way but if you would like different styles per viewer, you can add an id to the div. Reference that id in your CSS.

The following example changes the fullscreen icon of viewers with an id of speakers:

<style>
  #speakers .smv-button-fullscreen-open .smv-icon {
    -webkit-mask-image: url(https://scripts.sirv.com/sirvjs/v3/graphics/buttons/fullscreen.10.svg) !important;
  }
  #speakers .smv .smv-button-fullscreen {
    width: 100px;
    height: 100px;
  }
</style>
<div class="Sirv" id="speakers" data-src="https://demo.sirv.com/image.jpg" data-type="zoom"></div>

Cursor styles

By default, the native browser cursors are shown on hover over an image, to indicate if an image can be zoomed or dragged. These cursors can be changed or removed by editing the following CSS classes:

<style>
.smv-cursor-zoom-in {
  cursor: zoom-in;
}

.smv-cursor-zoom-out {
  cursor: zoom-out;
}

.smv-cursor-dragging {
  cursor: move;
}
</style>

Alt text

alt tags are added to images/spins if a description has been added to the asset in Sirv.

Alternatively, alt tags can be added via the data-alt attribute, for example:

<div class="Sirv">
  <div data-src="https://demo.sirv.com/example.spin" data-alt="Alt tag on spin"></div>
  <div data-src="https://demo.sirv.com/example.jpg" data-alt="Alt tag on zoomable image" data-effect="zoom"></div>
</div>

For accessibility, spins also have the additional attributes role="img" and aria-label="<alt text goes here>" added to the <canvas>.

Faster initialization

To load images faster, you can do 2 things:

1. Move sirv.js to the head
2. Use pre-fetch and preconnect

Move JS to the head

Your images, spins and videos are usually the most important items on your page, so give them top priority. Request the sirv.js file near the top of the <head> section of your HTML page. Ensure that it comes before any other script.

This will initiate requests for your images/spins/videos as soon as possible, typically improving their loading time by a few hundred ms or even 2+ seconds faster. This is especially true if your page contains many other JavaScript files.

Pre-fetch and preconnect

Prefetch the DNS and pre-initiate the connection to Sirv resources. This best-practice recommendation accelerates page loading and is automatically applied if you're using a Sirv plugin (Magento CDN extension, PrestaShop CDN addon or WordPress CDN plugin).

Paste the following code between the <head> and </head> of your HTML page, replacing your-sirv-account with your Sirv account name. If you use a custom domain, replace your-sirv-account.sirv.com with your custom domain:

<link rel="preconnect" href="https://scripts.sirv.com" crossorigin>
<link rel="preconnect" href="https://your-sirv-account.sirv.com" crossorigin>
<link rel="dns-prefetch" href="https://scripts.sirv.com">
<link rel="dns-prefetch" href="https://your-sirv-account.sirv.com">

Prefetch and preconnect can load your files 100-300 ms sooner for browsers that support preconnect. For browsers that only support DNS prefetch, files can load 10-150 ms sooner.

Referrer policy

It can be useful to know which URLs requested which files, so Sirv automatically applies the no-referrer-when-downgrade browser referral policy:

<img src="https://demo.sirv.com/example.jpg" referrerpolicy="no-referrer-when-downgrade">

That referrer policy tells the browser to include the full URL of the referring web page, instead of just the domain name. It is applied to all Sirv Media Viewer assets (images, spins and videos) and will help you troubleshoot any problems such as 404s or help you understand where particular requests originated from. These stats will be displayed on the Analytics section of your Sirv account.

Credit

Special thanks to Gravity 360 for the beautiful product imagery of the Snug Shack sofa.