Why is code after [removed]() not executed?

Question

I have the follwing JavaScript.

Answer 1

Because calling document.write implicity calls document.open, which clears the document on which it has been called:

If a document exists in the target, this method clears it

After the call to document.write, the element you're trying to get a reference to no longer exists in the DOM, and an error is thrown. If you look in the error console it should be something along the lines of the following:

TypeError: Cannot read property 'txt1' of undefined

Answer 2

document.write(content) writes content on the document stream.

You have to close the stream after writing on the document in order to continue the page loading

document.write("hello");
document.close();

• https://developer.mozilla.org/en-US/docs/DOM/document.write
• https://developer.mozilla.org/en-US/docs/DOM/document.close
• https://developer.mozilla.org/en-US/docs/DOM/document.open