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    <blockquote> <p>The advantage of this is that I don't have to sit with a checklist going through each browser - 'Is this header bold? Are these links underlined? Is this column 110px wide?' - every time I make a CSS change.</p> </blockquote> <p>Sure, but the secret is that you don’t have to do that now.</p> <p>If this header isn’t bold, then no-one’s going to die, or lose any money. Someone will notice*, and it’ll get fixed, with minimal effort.</p> <p>You’re better off spending time designing your CSS so that your styles are isolated (and thus unlikely to cause difficult-to-trace errors) than writing automated tests for every element on every page on your site.</p> <p>The amount of effort you’d need to get something like this working is disproportionate both to the difficulty of getting the code right (which isn’t much), and the consequences of getting the code wrong (which isn’t much either).</p> <p>More practically, how would you specify the kind of tests you're describing? You'd need to tell the test runner which elements it should check, and what each element's style should be. That's what CSS does. Maybe your definitions for which elements to check could be much more specific your CSS selectors (e.g. select each element on each page individually), but that would be very time-consuming, both to write initially and to maintain.</p> <p>(Just to elaborate on the necessary effort: for the cross-browser rendering tests you’re describing, you’d have to run actual web browsers (using something like Selenium), meaning you’d need multiple machines (for IE), all of which have to be accessible to your testing framework. This would be a nightmare to run personally, and very computationally intensive to offer as a service — just ask the guys who run <a href="http://litmus.com/" rel="nofollow">Litmus</a>.)</p> <p>Sorry that this isn’t really an answer to your actual question, but test-driven development can be a bit of a religion, in the sense that people get very inspired by the idea of it (which is admirable) without really understanding how it works, or where it actually offers a decent return on your time.</p> <hr> <p>* (Or, as I’ve experienced more frequently, no-one will notice, and you’ll spend a few seconds pondering the pointlessness of your professional existence before reaching for your third beer of the morning.)</p>
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    1. POIs there a way of testing CSS?
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    1. CO@Blowski: in that case, you’ve signed up to an insane contract that loses you money for tiny mistakes that take 60 seconds to fix, and despite that, you’ve failed to spend 3 seconds *looking* at the site you’re writing CSS for to check that the headings are bold. If those things are true, you might want to focus on them before confusing yourself further trying to set up automated CSS testing.
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    2. CO@Blowski: On a mostly unrelated note, [you have 72 HTML validation errors on your home page](http://validator.w3.org/check?uri=http%3A%2F%2Fwww.blowski.com%2F&charset=%28detect+automatically%29&doctype=Inline&group=0). Thankfully, in that case your client is you :)
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    3. CO@PaulD.Waite - relying on "hope the client doesn't notice and that it's a quick fix if they do" doesn't seem to be the best approach to development. Equally, the whole point of my post is that testing CSS is very time consuming, and I'm wondering if there's a quicker way of doing it, so saying "just look at the browser" is the same as saying to a software programmer "don't bother with unit tests - just use the software to check it works". I agree that it might end up being more hassle than it's worth, but that's why I'm asking.
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