#865536-204: drupal_add_js() is missing the 'browsers' option is being handled in #1952522: Bundler doesn't respect JS browser conditionals (via core patch). but there are other D7 patches that are useful.drupal_add_js D7 issuesdrupal_add_css D7 issues
CSS candidates#1021622-22: Improper escaping of CDATA for inline css#1034208-4: drupal_sort_css_js() ignores media and browser keys
Out of all the patches the only ones that can easily be done is a merge of #1140356: Add async, onload property to script tags & #1664602: Allow an attributes array to be passed in to drupal_add_js() for setting attributes such as "async" and "defer". This patch has been committed.
Is it OK to start using your D7 version on product site? Any recommendation/advice please?
If you've tested it out locally and it works, it should be OK to use.
Just be aware of #1946218: test with other modules & themes. I especially need to make sure advagg works with the CDN and CSS Embedded Images modules. I'm pretty sure I have advagg working with jQuery Update. And some nice to have integration would be JS script loaders like LABjs, HeadJS, and Script.js.
I plan on releasing an alpha once CDN and CSS Embedded Images is working 100%. Until a 7.x-2.x alpha version is released there is no upgrade path (from dev to dev).
In terms of AdvAgg, it hasn't been thoroughly performance tested so it could be doing redundant stuff on the PHP side of things. Also the advagg_mod submodule has some experimental stuff in in, so I would be careful with what you do when using it.
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