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To substitute the content in a textInput field, you can use the value property of the textInput element. For example, if you have a textInput field with id="myInput", you can use the following code to substitute its content:

var myInput = document.getElementById("myInput");
myInput.value = "new content";

This will set the value of the textInput field to "new content". You can change "new content" to whatever you want to substitute the original content of the field.