We could (and we often do) explain the difference between 'you're' with an apostrophe and 'your' without an apostrophe. Many, many people trip up on this pair of similar words. If that includes you, each time you waste a few seconds thinking about it. Or looking it up. Or using a grammar check, and wondering whether to trust it.
Since 1995, writing for the web is a phrase that has come full circle: literary writing online. Business writing, writing on the web, writing for the intranet, blogging, web content, SEO writing, content marketing, mobile content, accessible content, digital communication ... what next?