apache - Image spriting with mod_pagespeed -


i've installed google mod_pagespeed on apache 2.2 , seems working except fact image spriting not working.

i've set loglevel debug , message i'm getting is: 

[mon mar 10 17:51:58 2014] [info] [mod_pagespeed 1.6.29.7-3566 @26487] attempting sprite css background.

no further messages related spriting show in logs.

i can confirm image spriting switched on:

/mod_pagespeed_statistics?config

configuration: version: 13: on  filters ah  add head cw  collapse whitespace cc  combine css jc  combine javascript gp  convert gif png jp  convert jpeg progressive mc  convert meta tags pj  convert png jpeg dj  defer javascript ec  cache extend css ei  cache extend images es  cache extend scripts fc  fallback rewrite css  if  flatten css imports hw  flushes html ci  inline css ii  inline images il  inline @import link ji  inline javascript js  jpeg subsampling ll  lazyload images tu  left trim urls pr  prioritize critical css rj  recompress jpeg rp  recompress png rw  recompress webp rc  remove comments ri  resize images cf  rewrite css jm  rewrite javascript cu  rewrite style attributes url  sprite images cp  strip image color profiles md  strip image meta data

the image spiriting filter has lot of limitations, site hitting 1 or more of these issues.

from sprite images documentation:

limitations

the sprite images filter still experimental, , has number of limitations:

  • only png amd gif images supported; jpg come in future release.
  • only css backgrounds supported; <img> tags come in future release.
  • a background image can't safely sprited if html element larger background image (since allow combined image's pixels show around edges). accordingly, css must have explicit width , height in same declaration background url, , width , height must smaller or equal of image.
  • the css must not include background-position declarations without background-url declarations. such naked background-position declaration apply background-image, , since don't know one, isn't safe spriting.
  • the sprite images filter arranges images in vertical strip, might not efficient arrangement. more advanced layouts come in future release.

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