[Commentor] LC-342 Charles McCathieNevile on behalf of Opera Software [Working Group decision] We have updated the document to clarify that content should not rely on scripting, and avoid using scripting as much as possible due to battery considerations. [Commentor reply] yes [Comment] 
This Best Practice should require that content not rely on scripting, unless the delivery context is known to support them. Some mobile browsers allow the user to turn off javascript (handy where you are trying to save battery). It should also lean away from using script unless necessary - it is one of the more battery-intensive ways to do most things. It should also cross-reference requirements on page size, and a best practice on page size vs latency (see Opera's comment on "missing points") cheers Chaals