Edit comment LC-2279 for Mobile Web Best Practices Working Group

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Comment LC-2279

Comment Shortname:

Commenter: Marc Wilson <marcwilson@google.com>

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Section of the document concerned:

[Free text description]Document as a wholeMobile Web Application Best Practices W3C Working Draft 6 October 2009 Abstract Status of this Document Table of Contents Appendices List of Best Practices 1 Introduction 1.1 Purpose of the Document 1.2 Audience 1.3 Scope 1.3.1 Best Practices 1.3.2 Web Application 1.3.3 Mobile Context 1.3.4 Delivery Context 1.4 Relationship to other Best Practices and recommendations 1.5 Terminology 2 Structure of Best Practice Statements 3 Best Practice Statements 3.1 Application Data 3.1.1 Use Cookies Sparingly 3.1.1.1 What it means 3.1.2 Use Appropriate Client-Side Storage Technologies for Local Data 3.1.2.1 What it means 3.1.2.2 How to do it 3.1.3 Replicate Local Data To A Server If Necessary 3.1.3.1 What it means 3.1.3.2 How to do it 3.2 Security and privacy 3.2.1 Do not Execute Unescaped or Untrusted JSON data 3.3 User Awareness and Control 3.3.1 Inform the User About Automatic Network Access 3.3.1.1 What it means 3.3.1.2 How to do it 3.3.2 Provide Sufficient Means to Control Automatic Network Access 3.3.2.1 What it means 3.3.2.2 How to do it 3.3.3 Ensure the User is Informed About Use of Personal and Device Information 3.3.3.1 What it means 3.3.3.2 How to do it 3.3.4 Enable Automatic Sign-in 3.3.4.1 What it means 3.3.4.2 How to do it 3.4 Conservative use of resources 3.4.1 Use Transfer Compression 3.4.1.1 What it means 3.4.1.2 How to do it 3.4.2 Minimize Application and Data Size 3.4.2.1 What it means 3.4.2.2 How to do it 3.4.3 Avoid Redirects 3.4.3.1 What it means 3.4.3.2 How to do it 3.4.4 Optimize Network Requests 3.4.4.1 What it means 3.4.4.2 How to do it 3.4.5 Minimize External Resources 3.4.6 Aggregate Static Images into a Single Composite Resource (Sprites) 3.4.7 Include Background Images Inline in CSS Style Sheets 3.4.8 Cache Resources By Fingerprinting Resource References 3.4.9 Cache AJAX Data 3.4.10 Don't Send Cookie Information Unnecessarily 3.4.11 Keep DOM Size Reasonable 3.4.11.1 What it means 3.4.11.2 How to do it 3.5 User Experience 3.5.1 Optimize For Application Start-up Time 3.5.1.1 What it means 3.5.1.2 How to do it 3.5.2 Minimize Perceived Latency 3.5.2.1 What it means 3.5.2.2 How to do it 3.5.3 Design for Multiple Interaction Methods 3.5.3.1 What it means 3.5.3.2 How to do it 3.5.4 Preserve Focus on Dynamic Page Updates 3.5.4.1 What it means 3.5.4.2 How to do it 3.5.5 Use Fragment IDs to Drive Application View 3.5.6 Make Telephone Numbers "Click-to-Call" 3.5.6.1 What it means 3.5.6.2 How to do it 3.5.6 Ensure Paragraph Text Flows 3.5.8 Ensure Consistency Of State Between Devices 3.5.9 Consider Mobile Specific Technologies for Initiating Web Applications 3.5.9.1 What it means 3.5.9.2 How to do it 3.5.10 Consider Use of Canvas Tag or SVG For Dynamic Graphics 3.5.10.1 What it means 3.5.10.2 How to do it 3.5.11 Use viewport Meta Tag To Identify Desired Screen Size 3.5.11.1 What it means 3.5.11.2 How to do it 3.6 Handling Variations in the Delivery Context 3.6.1 Prefer Server-Side Detection Where Possible 3.6.1.1 What it means 3.6.1.2 How to do it 3.6.2 Use Client-Side Capability Detection Where Necessary 3.6.2.1 What it means 3.6.2.2 How to do it 3.6.3 Use Device Classification to Simplify Content Adaptation 3.6.3.1 What it means 3.6.3.2 How to do it 3.6.4 Support a non-JavaScript Variant if Appropriate 3.6.4.1 What it means 3.6.4.2 How to do it 3.6.5 Offer Users a Choice of Interfaces 3.6.5.1 What it means 3.6.5.2 How to do it Appendix: Best Practice Dependent Device Properties A Related Reading (Non-Normative) B References (Non-Normative) B.1 MWI References B.2 Device Independence B.3 Web, Protocols and Languages B.4 Other References
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Refinement of the section concerned:

Status:

open proposal pending resolved_yes resolved_no resolved_partial other assigned to Nobody

Type: substantive editorial typo question general comment undefined

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Response drafted Resolution implemented Reply sent to commenter

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No response from Commenter yet Commenter approved disposition Commenter objected to disposition
Commenter's response (URI):

Comment:

3.4.5.1
This is a dangerous recommendation when even modern browsers like
mobile safari on iPhone have a limited browser cache entry size of
25kb uncompressed. It is a good recommendation but relies partially on
the assumption that the caching of a single large resource is no worse
than multiple single resources.

Related issues: (space separated ids)

WG Notes: Resolution: http://www.w3.org/2009/12/09-bpwg-minutes.html#added13

Resolution: We think that this limitation is obsolete and that the best practice is good in the generic case. We do not think that we can recommend an explicit size limit as this is likely to evolve over time.

(Please make sure the resolution is adapted for public consumption)