When attempting to validate a schema.org/Article against Google's Structured Data Testing Tool, I noticed that it gives an error if you specify an SVG image:
The value provided for logo must be a valid URL.
Required by:
AMP Articles (what's this?)
When the URL is changed to have a .png (or .jpg, .bmp, .webp, etc.) extension, rather than .svg, it passes validation.
Here is the example I'm working with:
<div itemscope itemtype="http://schema.org/Article">
<div itemprop="publisher" itemscope itemtype="https://schema.org/Organization">
<meta itemprop="name" content="Example" />
<meta itemprop="url" content="http://example.com" />
<div itemprop="logo" itemscope itemtype="https://schema.org/ImageObject">
<meta itemprop="url" content="http://example.com/logo.svg" />
<meta itemprop="width" content="600" />
<meta itemprop="height" content="60" />
</div>
</div>
<meta itemprop="dateModified" content="2016-01-05T12:43" />
<meta itemprop="datePublished" content="2016-01-05T12:43" />
<meta itemprop="headline" content="Example" />
<meta itemprop="name" content="Example" />
<meta itemprop="author" content="Example" />
<link itemprop="mainEntityOfPage" href="http://example.com/article" />
<div itemprop="image" itemscope itemtype="https://schema.org/ImageObject">
<meta itemprop="url" content="http://example.com/article.jpg" />
<meta itemprop="width" content="1200" />
<meta itemprop="height" content="800" />
</div>
</div>
Changing the other image's URL's extension will also produce the error.
I was unable to find any information on why it rejects SVGs in the Rich Snippets documentation or the AMP HTML spec. Does anyone have an explanation for this behavior?
From one of the links you gave: https://developers.google.com/structured-data/rich-snippets/articles
Images should be in .jpg, .png, or. gif format.
Why? Who knows. Perhaps because SVGs still have some support issues in some browsers (particularly older ones).