The Web VS WebPagetest

The W3C website is a great resource, the section on ARIA](https://www.w3.org/WAI/ARIA/apg/) and as others have pointed out the patterns section is great and includes examples. Source: about 1 year ago

I copied that directly into the validator at w3.org and it showed no errors. https://validator.w3.org/nu is what you're using, yes? Source: about 1 year ago

Time to start Googling! Those are all solvable things that you can fix. The last ones in black are strange though... I have no idea what the reference to w3.org is for. Source: over 1 year ago

Google tells me some pages on my website have mobile usability errors - detailed results on GSC show 45 of 75 resources couldn't be loaded, many are apparently script and stylesheet issues to do with the theme and some plugins. The affected pages also load very slowly on GTMetrix. I turned on minify html, css and js on my caching plugin but it didn't seem to help. I did a Validate CSS check using a tool on w3.org... Source: over 1 year ago

Depending on what prompted this issue, there are a myriad of resolutions. If it's your SSL certificate then you simply need to get that registered and compliant. If it's because of bad coding then you can check out https://w3.org to test your code and fix it. Otherwise, you could always hire or consult a web developer. Source: over 1 year ago

Trust neither. The most optimal option I've found is webpagetest.org Its been quite handy lately. This tool does look interesting. Source: about 1 year ago

Webpagetest.org is another. Pagespeedinsights and lighthouse are great for identifying page load issues to fix, but actual page load times will always vary between the user and your web server. Universal analytics has some page load timings but that's going away soon and nothing afaik is in GA4. I've seen an example of building a page load timer in tag manager and dumping the results into an event. Source: about 1 year ago

So I am working on rebuilding our company's site with a new stack. I am running tests using webpagetest.org, and I am having trouble fully understanding the speed index results as well as the film strip view. The page renders quite fast everywhere I test it. Google Lighthouse shows it in the 90s + for performance score, however when I test the page on webpagetest, I get load times of 77 seconds (NOT MS) which is... Source: about 1 year ago

Webpagetest.org is great, and checking OP's site they have done an incredible job, I don't think I have ever made or seen an Ecom site this slick. Super clean waterfall view. Source: about 1 year ago

Thanks for the recommendation regarding webpagetest.org, another user made a similar recommendation so I will check it out. Source: about 1 year ago