I think this is relevant in the code, from 
https://github.com/apache/incubator-pagespeed-mod/blob/b4bf44cc56d8bbf17494c540dfb6ef20dfcf5073/net/instaweb/rewriter/rewrite_options.cc#L640

```c++
// Note: all Core filters are Test filters as well.  For maintainability,
// this is managed in the c++ switch statement.
const RewriteOptions::Filter kTestFilterSet[] = {
    RewriteOptions::kConvertJpegToWebp,
    RewriteOptions::kDebug,
    RewriteOptions::kDeferIframe,
    RewriteOptions::kDeferJavascript,
    RewriteOptions::kDelayImages,  // AKA inline_preview_images
    RewriteOptions::kIncludeJsSourceMaps,
    RewriteOptions::kInsertAmpLink,
    RewriteOptions::kInsertGA,
    RewriteOptions::kInsertImageDimensions,
    RewriteOptions::kLazyloadImages,
    RewriteOptions::kLeftTrimUrls,
    RewriteOptions::kMakeGoogleAnalyticsAsync,
    RewriteOptions::kPrioritizeCriticalCss,
    RewriteOptions::kResizeToRenderedImageDimensions,
    RewriteOptions::kResponsiveImages,
    RewriteOptions::kRewriteDomains,
    RewriteOptions::kSpriteImages,
};
```

Doc pull requests welcome! :-)

[ Full content available at: 
https://github.com/apache/incubator-pagespeed-mod/issues/1797 ]
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