utags opened a new issue #2050:
URL: https://github.com/apache/incubator-pagespeed-mod/issues/2050


   When I view the pagespeed messages, I can see that there's several warning 
about the "CSS parsing error ". 
   
   `[Wed, 11 Nov 2020 17:58:21 GMT] [Warning] [10334] CSS parsing error in 
https://site.com/drink-recipes/`
   
   What kind of thing case this css error? 
   
   ```
   pagespeed                                     on;
   
   #add header
   pagespeed XHeaderValue "Powered By ngx_pagespeed";
   
   location ~ "\.pagespeed\.([a-z]\.)?[a-z]{2}\.[^.]{10}\.[^.]+" {
         add_header " " " ";
           }
   
   location ~ "^/pagespeed_static/" { }
   location ~ "^/ngx_pagespeed_beacon$" { }
   
   #InPlaceResourceOptimization 
   pagespeed InPlaceResourceOptimization on;
   
   #Preserve URL Relativity
   pagespeed PreserveUrlRelativity on;
   
   #unoptimized resources
   pagespeed InPlaceSMaxAgeSec 10;
   
   pagespeed Allow "*";
   
   #browser-specific in-place optimization
   pagespeed EnableFilters in_place_optimize_for_browser;
        
   #Disable PageSpeed Core Filters and enabale one by one.
   pagespeed RewriteLevel                        PassThrough;
   
   pagespeed FileCachePath                        
/var/cache/ngx_pagespeed_cache;
   
   pagespeed AllowVaryOn                                                  
"Auto";
   
   #Cause Render Blocking CSS
   pagespeed EnableFilters                                        
hint_preload_subresources;
   
   pagespeed UseExperimentalJsMinifier           on;
   
   #Rewrite Domains
   pagespeed EnableFilters rewrite_domains;
   
   #Sizes
   pagespeed JsOutlineMinBytes                            3000;
   pagespeed MaxCombinedCssBytes                 -1;
   pagespeed MaxCombinedJsBytes                  1000000;
   
   pagespeed CssInlineMaxBytes                   1000;
   pagespeed JsInlineMaxBytes                    1500;
   
   #Flatten CSS Imports
   pagespeed CssFlattenMaxBytes                                   4000;
   
   pagespeed LazyloadImagesAfterOnload           on;
   
   pagespeed RewriteDeadlinePerFlushMs           2000;
   pagespeed MaxCacheableContentLength           2048000;
   
   pagespeed FetchHttps                          enable;
   pagespeed FetchHttps                          enable,allow_self_signed;
   
   # Implicit cache-lifetime for resources
   pagespeed ImplicitCacheTtlMs                  3600000;
   
   # In-memory LRU Cache
   pagespeed LRUCacheKbPerProcess                16192;
   pagespeed LRUCacheByteLimit                   64384;
   
   pagespeed EnableCachePurge                    on;
   pagespeed PurgeMethod                         PURGE;
   
   pagespeed DownstreamCacheRebeaconingKey       "{{PAGESPEED_BEACON}}";
   
   pagespeed RespectVary                         on;
   pagespeed RespectXForwardedProto              on;
   
   pagespeed LowercaseHtmlNames                  on;
   
   #Extend Cache
   pagespeed EnableFilters extend_cache;
   
   #Fix PageSpeed remove comment AMP validation error.
   pagespeed RetainComment "AMP_VALIDATION:*";
   
   #Disable meta refresh.
   pagespeed SupportNoScriptEnabled false;
   
   pagespeed WebpQualityForSaveData 50;
   pagespeed WebpRecompressionQuality 75;
   
   #Combine CSS wildcard.
   pagespeed MinImageSizeLowResolutionBytes      10;
   pagespeed PermitIdsForCssCombining font*;
   pagespeed PermitIdsForCssCombining *-css;
   pagespeed PermitIdsForCssCombining ver*;
   pagespeed PermitIdsForCssCombining gmw*;
   pagespeed PermitIdsForCssCombining mashsb*;
   pagespeed PermitIdsForCssCombining rs*;
   pagespeed PermitIdsForCssCombining chosen*;
   pagespeed PermitIdsForCssCombining contact*;
   pagespeed PermitIdsForCssCombining redux*;
   pagespeed PermitIdsForCssCombining js_composer*;
   pagespeed PermitIdsForCssCombining footer*;
   pagespeed PermitIdsForCssCombining woocommerce*;
   pagespeed PermitIdsForCssCombining wc*;
   pagespeed PermitIdsForCssCombining dashicons*;
   pagespeed PermitIdsForCssCombining blade*;
   
   #requirement for combine css and js
   pagespeed CombineAcrossPaths on;
   
   pagespeed MaxSegmentLength 2048;
   
   #JavaScript Optimization.
   pagespeed EnableFilters                       
rewrite_javascript,outline_javascript,combine_javascript,extend_cache,local_storage_cache,canonicalize_javascript_libraries,defer_javascript,rewrite_javascript_external;
   
   #Other Optimization.
   pagespeed EnableFilters                       insert_dns_prefetch,add_head;
   pagespeed RetainComment                                        " 
google_ad_section*";
   pagespeed EnableFilters                                        trim_urls;
   
   #3rd Party script Optimization.
   pagespeed GoogleFontCssInlineMaxBytes         20000;
   pagespeed EnableFilters                       inline_google_font_css;
   pagespeed EnableFilters                                        
make_show_ads_async;
   pagespeed EnableFilters                                        
make_google_analytics_async;
   
   #HTML Optimization.
   pagespeed EnableFilters                       
elide_attributes,remove_comments,combine_heads,collapse_whitespace,remove_quotes;
   
   #CSS Optimization.
   pagespeed EnableFilters                       
prioritize_critical_css,rewrite_css,combine_css,fallback_rewrite_css_urls,flatten_css_imports,inline_css,inline_import_to_link,rewrite_style_attributes_with_url,move_css_above_scripts,move_css_to_head;
   pagespeed PermitIdsForCssCombining            *-css;
   
   #Image Optimization.
   pagespeed EnableFilters                       
inline_preview_images,resize_rendered_image_dimensions,insert_image_dimensions,responsive_images,resize_images,lazyload_images,dedup_inlined_images,inline_images,rewrite_images,recompress_images,rewrite_css,sprite_images,convert_png_to_jpeg,convert_jpeg_to_webp,convert_to_webp_animated,convert_to_webp_lossless,recompress_webp;
   
   #Mobile Optimization.
   pagespeed EnableFilters                                                
resize_mobile_images;
   
   #Browser Optimization
   pagespeed EnableFilters                            convert_meta_tags;        
                                  
   
   # redis storage backend
   #pagespeed RedisServer "{{REDIS_UPSTREAM}}";
   #pagespeed RedisTimeoutUs 1000;
   ```


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