Speed performance
Page content can be delayed if you use document.write().
If you use it, notice that browsers can show error messages in some cases:
[Violation] Avoid using document.write().
An unbalanced tree was written using document.write() causing
data from the network to be reparsed.
If a document.write() is not blocked by Chrome, SeoChecker will notify it in a table like the one below:
You should delete document.write() and use asynchronous loading.
Learn more about Speed performance
On page SEO performance and page checkup.
Over 300 parameters for the deeper page analysis.
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