Tool for automated validation of web-page against formatting/layout rules?

Im a UI developer on a financial website and been tasked with finding (or creating) a tool to automate testing pages against a bunch of formatting/layout rules

Example rules;

• use of bracket format for numbers: (123) rather than -123
• use of ISO codes for financial amounts: USD 123 rather than $123
• all numbers should be right justified
• 开发者_运维问答checking of format and case of various text labels
• (nice to have) checking of specified padding widths between certain elements
• (nice to have) image comparison against known good screenshots

Also - the tool will need to be usable on a non public version of the site (i.e. for internal pre-prod testing)

Is anyone aware of any tools for doing this kind of thing? Ive googled around but couldn't find anything even remotely close. I could create a bespoke tool to do this but Id much rather not reinvent the wheel if I can help it!

Cheers!

Some time ago I adapted a validation engine called mobileOk checker, that performs some validations to make sure a web page is mobile friendly, but can be easily extended to include your own tests.

Tests can be implemented in Java or using XSL. For example this test (under /src/org/w3c/mwi/mobileok/basic/xslt) checks whether a popup exists in the page or not.

In the "Documents" section of this page you can access the sources. I don't know its current state, but it is opensource. If you don't find anything better, it could be a starting point. Maybe it is harder to take a look at how it works than implementing it by yourself...