Highlight words in snippet

'use strict';
var st = new Object;

// ES1
function Number_toString(x, base) {
  if ((2 > base) || (base > 16)) {
    throw 'radix must be between 2 and 16';
  }
  var h = '0123456789abcdef';
  var s = h.charAt(x % base);
  while (x = (x / base) | 0) {
    s = h.charAt(x % base) + s;
  }
  return s;
}

// JS1
function String_substring(th, from, to) {
  if (th.substring) {
    return th.substring(from, to);
  }
  var c;
  from = from - 1;
  var o = '';
  while ((th.length > (from = from + 1)) && (to > from)) {
    c = th.charAt(from);
    o = o + c;
  }
  return o;
}

function removeAfter(s, t) {
  var i = s.indexOf(t);
  if (i >= 0) {
    s = String_substring(s, 0, i + t.length);
  }
  return s;
}

function escapeHtm(s) {
  var h = '';
  var c;
  var n = s.length;
  var i = -1;
  while (n > (i = i + 1)) {
    c = escapeHtmChar(s.charAt(i));
    h = h + c;
  }
  return h;
}

function hashCode(s) {
  var h = 0;
  var n = s.length;
  var i = -1;
  while (n > (i = i + 1)) {
    h = (((h << 5) - h) + s.charCodeAt(i)) | 0;
  }
  return h;
}

function colorWord(s) {
  var h = hashCode(s + '~' + s) << 5;
  var c = 0;
  var i = 4;
  while (i = i - 1) {
    c = (c << 4) | ((64 + ((31 & (h = h >> 5)) * 12)) / 32);
  }
  c = Number_toString(c, 16);
  return '<' + 'span style="color:#' + c + '">' + s + '<' + '/span>';
}

function submit() {
  var s = window.f.t.value;
  var h = colorText(s);
  if (st.docClosed) {
    s = escapeHtm(s);
    h = '<' + 'form name=f width="100%" action="javascript:app.submit()">' +
      '<' + 'textarea name=t accesskey=t width="100%" cols=40 rows=9>' +
      s + '<' + '/textarea><' + 'br>' +
      '<' + 'input type=submit value=Update accesskey=u>' +
      ' You can input source text to process' +
      '<' + '/form>' +
      h;
  }
  writeHtm(h);
}

function init() {
  submit();
  st.docClosed = 1;
  var app = new Object;
  app.submit = submit;
  return app;
}

init();

You can input source text to process

Introduction

Color determined by the hash code of each word.

You can install a web browser that supports at least JavaScript 1.0 (1995) and CSS1 to run this application or you may consider implementing a GemiWeb0 browser with JavaScript0 and CSS0 yourself according to the following specification:
bkil.gitlab.io/gemiweb0