Thanks for the report! I'll fix the doc.
In the code, core filters listed in rewriter/rewrite_options.cc in
kCoreFilterSet, if you want to see the final authority on which ones
are core:
RewriteOptions::kAddHead,
RewriteOptions::kCombineCss,
RewriteOptions::kCombineJavascript,
RewriteOptions::kConvertGifToPng, // rewrite_images
RewriteOptions::kConvertJpegToProgressive, // rewrite_images
RewriteOptions::kConvertJpegToWebp, // rewrite_images
RewriteOptions::kConvertMetaTags,
RewriteOptions::kConvertPngToJpeg, // rewrite_images
RewriteOptions::kExtendCacheCss, // extend_cache
RewriteOptions::kExtendCacheImages, // extend_cache
RewriteOptions::kExtendCacheScripts, // extend_cache
RewriteOptions::kFallbackRewriteCssUrls,
RewriteOptions::kFlattenCssImports,
RewriteOptions::kInlineCss,
RewriteOptions::kInlineImages, // rewrite_images
RewriteOptions::kInlineImportToLink,
RewriteOptions::kInlineJavascript,
RewriteOptions::kJpegSubsampling, // rewrite_images
RewriteOptions::kRecompressJpeg, // rewrite_images
RewriteOptions::kRecompressPng, // rewrite_images
RewriteOptions::kRecompressWebp, // rewrite_images
RewriteOptions::kResizeImages, // rewrite_images
RewriteOptions::kRewriteCss,
RewriteOptions::kRewriteJavascript,
RewriteOptions::kRewriteStyleAttributesWithUrl,
RewriteOptions::kStripImageColorProfile, // rewrite_images
RewriteOptions::kStripImageMetaData, // rewrite_images
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