![]() ![]() The problem is that if the script dynamically injects another script with document.write(), the parser is forced to wait for the new external resource to be downloaded. And if the HTML parser encounters a script, it has to stop and launch it before continuing. This happens because before the browser can render a web page, it needs to generate the entire DOM tree. In detail, this statement can slow down the loading time of a web page by dozens of seconds. In this 2016 article, Google delved into why document.write() represents an issue for users on slow connections. Let’s see how the PostScribe library can help solve the issue in React or Next.js, in both JavaScript and TypeScript. Since you typically cannot change the code of these external scripts, this can easily become a headache. In some cases, it may even be blocked by the browser for speed reasons, making the imported external script broken. This does not only come with restrictions but its usage is discouraged and reported with a warning in the browser console. The problem here is that those external scripts frequently use the document.write() statement. ![]() This is especially true when dealing with ads. When developing a React or Next.js app, you might need to import external JavaScript files through the HTML tag. ![]()
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