A script for Google Docs, gently turning white text to black in the first paragraph of a document.

Fade-In-Text.gs

function myFunction() {
  
  var doc = DocumentApp.getActiveDocument();
  var body = doc.getBody();
  var paragraph = body.getChild(0);
  var txt = paragraph.asParagraph().getChild(0); //This returns the text in the first paragraph.
  var len = txt.asText().getText().length; //This returns the number of characters in the first paragraph.
  Logger.log(len);
  var red = 250;
  var green = 250;
  var blue = 250;
  var incrementVal = 250/len;
  var x = 0;
  var rgbHex = rgbToHex(red, green, blue);
  
  for (var i = 0; i<len; i++) {
    string = txt.asText().getText().charAt(i);
    if (red>0 && string!=" ") {
    rgbHex = rgbToHex(red, green, blue);
    txt.asText().setForegroundColor(i,i,rgbHex);
    x = x + incrementVal
    if (x>1) {  
    red = red-1;
    green = green-1;
    blue = blue-1;
    x = 0
    };
    };
    };
}

function componentToHex(c) {
    var hex = c.toString(16);
    return hex.length == 1 ? "0" + hex : hex;
}

function rgbToHex(r, g, b) {
    return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}