Diogenes Painting by Jean Leon Gerome   T oday I was in need of a simple solution to get targeted parameters to a HTML page  I'm in a platform that only accepts a page as home page HTML. In my case my login page.  I needed that if the login had not success, then one message would be passed to this same page be reloaded,  reading and showing  the message.  I did not want to create a second page that is always overlooked when changing the layout or css.   After a little search I wrote the follow code:   to use, create a HTML file like: parametro.html   open with your browser, type something like:   file:///yourfolder/parametro.html?param=Hello World¶m2=21/12/1966     <!DOCTYPE HTML>  <HTML LANG="pt-br">  <HEAD>  <SCRIPT>  /**   * Example of how to read the parameters of    * a URL when loading a page using javascript   * @author Nivio dos Santos   * @version 1.0   */   /**   * Creating namespace in order to av...