Definition
Render readability is whether a page's content exists in the HTML that a crawler receives, or only appears after JavaScript runs in a browser.
Why it matters
A JavaScript-only page is an empty shell to most crawlers. This is a common failure in modern site builds and it silently voids all the content work behind it.
How it is used
Disable JavaScript in a browser and open the page. What remains is roughly what a crawler sees.
Related terms
Concepts that only make sense together
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