// I'm not sure, I have this bad feeling
    // Breaking the line here is not good for some browers.
    // It doesn't feel right.
    var html_str = 
        '<header>' +
          '<h1>Array Merging instead of string concatination</h1>' +
          '<h2>Formatting using array.join</h2>'+
          '<p class="intro-para">A nice way to organize multiline strings.</p>'+
        '</header>';
        
        
    // I'm guilty of
    var html_str = '<header>' +
          '<h1>Array Merging instead of string concatination</h1>' +
          '<h2>A nice way to format using array.join</h2>'+
          '<p class="intro-para">A nice way to organize multiline strings.</p>'+
        '</header>';


    // Sometimes written in one line
    var html_str = '<header>' + '<h1>Array Merging instead of string concatination</h1>' + '<h2>A nice way to format using array.join</h2>'+ '<p class="intro-para">A nice way to organize multiline strings.</p>' + '</header>';


    // Using variables
    var title_variable = 'Array Merging instead of string concatination';
    var sub_title_variable = 'A nice way to format using array.join';
    var intro_para_variable = 'A nice way to organize multiline strings.';

    var html_str = '<header>' + '<h1> ' + title_variable + ' </h1>' + '<h2> ' + sub_title_variable + '</h2>'+ '<p class="intro-para">' + intro_para_variable + '</p>' + '</header>';
    

    // Make an array and join them together as a string.
    var html = [
      '<header class="hello">',
        '<h2>Array Merging instead of string concatination</h2>',
        '<h3>A fancy Subtitle</h3>',
        	'<p class="intro-para">Lorem Ipsum</p>',
      '</header>'
    ].join('');


    // With Variables
    // It's nice that the comas are used for separation
    // and the + can be soley used for appending things.
    var title_variable = 'Array Merging instead of string concatination';
    var sub_title_variable = 'A nice way to format using array.join';
    var intro_para_variable = 'A nice way to organize multiline strings.';

    var html = [
      '<header class="hello">',
        '<h2>' + title_variable + '</h2>',
        '<h3>' + title_variable + '</h3>',
        	'<p class="intro-para">' + title_variable + '</p>',
      '</header>'
    ].join('');

    // Performance gains in maintainablity outway any small gains using a string.  
    // Browsers are very fast at managing arrays like this.