Hello @sammydepthphoto, monitoring availability of sizes is a common use case. Following post shows a solution for zara.com. A similar technique can be used to monitor product availability for nike.com.
To summarize it, there are two methods:
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First one is to monitor a filtered list of available items. Any change to that list will trigger an alert. Adding a condition for the desired size will trigger the alert only when that size is added to the list of available sizes. If you can share the page’s URL, I can share a selector that can do that.
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The second method is to track changes to HTML using
innerHTML
orouterHTML
property of monitored element. It works because HTML is used to show a size as available (black) or unavailable (gray).
Try it out and feel free to reach out if you need any help.