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]) that I’d stumbled upon and they showed these errors on the page (see image), and 100+ other warnings along the lines of ”the property XYZ is deprecated”, ”XYZ is a vendor extension” and ”CSS variables are currently not statically checked”
I don’t know code and this has gone quite beyond my layperson abilities. Any ideas about what’s causing them and how I can fix them? TIA.
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