To check if a child and its parent belong to the same document (in JavaScript), you can compare the ownerDocument attribute of each element. Here's an example code snippet:

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const parent = document.getElementById('parent');
const child = document.getElementById('child');

if (parent.ownerDocument === child.ownerDocument) {
  console.log('Parent and child belong to the same document.');
} else {
  console.log('Parent and child belong to different documents.');
}

This code snippet selects an element with the ID of parent and an element with the ID of child. It then compares the ownerDocument attribute of each element. If they are the same, it logs to the console that the parent and child belong to the same document. Otherwise, it logs that they belong to different documents.

You can use a diff tool to compare two files and highlight the differences between them. A popular diff tool is diff which is available in most Unix-based systems. Here's how to use it:

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$ diff file1.txt file2.txt

This will output a list of differences between the two files, with a > sign indicating lines present in file2 but not file1, and a < sign indicating lines present in file1 but not file2. This is a simple and effective way to identify differences between two files.

Alternatively, you can also use graphical diff tools like Beyond Compare or Meld which provide a more user-friendly interface to compare files. Here are their websites:

• Beyond Compare: https://www.scootersoftware.com/
• Meld: http://meldmerge.org/

In JavaScript, you can ignore space when comparing prompts by removing all the whitespace from both strings before comparing them. Here's an example code using .replace() function which replaces whitespace with empty string:

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let prompt1 = " How   to compare strings     ignoring   spaces  ";
let prompt2 = "How to compare strings ignoring spaces";

// Remove all white space from both strings
prompt1 = prompt1.replace(/\s/g, '');
prompt2 = prompt2.replace(/\s/g, '');

// Compare both strings without space
if (prompt1 === prompt2) {
  console.log("The prompts are the same ignoring spaces.");
} else {
  console.log("The prompts are different.");
}

This code removes all whitespace characters (spaces, tabs, and newlines) using the regular expression /\s/g with .replace() function. Then, it compares both strings without spaces using the === operator, which compares the values and the data types. In this example, the output would be "The prompts are the same ignoring spaces."

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function higherOrLower(value1, value2) {
  if(value1>value2){
    return "higher";
  } else if(value1<value2){
    return "lower";
  } else {
    return "equal";
  }
}

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You can compare two strings using the method .length to check the length of a String. If the String you are comparing has a larger length than the other, it will return "true".

Example in JavaScript:

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let string1 = "Hello World!";
let string2 = "Hi";

let isBigger = string1.length > string2.length;
console.log(isBigger); //returns true