Re: Support Existing Content

On Apr 27, 2007, at 7:48 AM, Gareth Hay wrote:

> On 27 Apr 2007, at 15:35, Henri Sivonen wrote:
>>> Surely any browser manufacturer is always going to have a mode  
>>> that will render older pages.
>>> What is preventing them having an HTML5 mode, which may or may  
>>> not build upon their previous engine.
>> ...
>>> Why is this a problem?
>> The problem from the browser vendor point of view is the increased  
>> cost of code development and the increased cost of quality assurance.
> Ok, I 've asked before, so I'll ask again, how?
> option 1.
> Add HTML5 on top of current code, adding more complexity to current  
> code base.
> option 2.
> stop existing code. Begin HTML5 parser (starting from what we have,  
> but forking)
> I don't see either being a signifignatly different cost.

The biggest cost differences are not in initial development but in  
testing and ongoing maintenance. You have the following costs per mode:

- Initial qualification testing has to be done for each mode
- Ongoing maintenence cost for things like crashes and hangs
- Q/A for updates has to be done for each mode
- Each separate mode is additional potential surface area for  
security bugs
- Any change that might affect multiple modes is harder to do and  
more error-prone

I think the fallacy in your argument is really that "stop existing  
code" is possible. As long as you are shipping a code base, it has  
ongoing maintenance costs.


Received on Friday, 27 April 2007 20:49:28 UTC