Everytime I've shared this with someone I always left something out of it so I decided to keep it all in one place and this is the one place.  It wouldn't fit on stackoverflow.com so I put it on mywebsite instead.
Codes.gs

    function onOpen()
    {
      DocumentApp.getUi().createMenu('My Tools')
        .addItem('lookinInside','lookinInside')
        .addItem('highLightCurrentSelection','highLightCurrentSelection')
        .addItem('removeAllBlankLines','removeAllBlankLines')
        .addItem('addRowToTable','addRowToTable')
        .addItem('getBodyText','getBodyText')
        .addItem('getAllText','getAllText')
        .addItem('setTableCellText','setTableCellText')
        .addItem('setListItemText','setListItemText')
        .addSeparator()
        .addItem('loadParagraphSidebar','loadParagraphSidebar')
        .addItem('getRevisionHistory','getRevisionHistory')
        .addItem('Setup as Envelope #10', 'setupDocument')
        .addItem('Insert Return Address', 'insertReturnAddress')
        .addItem('Insert Recipient Address', 'insertRecipientAddress')
        .addToUi();
    }
    
    function dispStuff(stuff,title,width,height)
    {
      var width=(typeof(width)!='undefined')?width:500;
      var height=(typeof(height)!='undefined')?height:500;
      var title=(typeof(title)!='undefined')?title:'Displaying Stuff';
      DocumentApp.getUi().showModelessDialog(HtmlService.createHtmlOutput(stuff).setWidth(width).setHeight(height), title);
    }
    
    function removeAllBlankLines() {
      var doc = DocumentApp.getActiveDocument();
      var content = doc.getBody().editAsText().getText();
      //Logger.log('typeof content: ' + typeof content)
      if (!content || content === " ") {return " "};
      content = content.replace(/^\s*\n/gm,"");
      doc.getBody().setText(content);
    }
    
    function addRowToTable()
    {
      var doc = DocumentApp.getActiveDocument();
      var body = doc.getBody();
      var tablerow = body.getChild(11).asTable().appendTableRow();
      var a=['Left Side','Right Side'];
      for(var i=0;i<2;i++)
      {
        tablerow.appendTableCell(a[i]);
      }
    }
    
    function getBodyText()
    {
      var doctext=DocumentApp.getActiveDocument().getBody().editAsText().getText();
      var txt=HtmlService.createHtmlOutput(doctext);
      DocumentApp.getUi().showModelessDialog(txt, 'Body Text')
    }
    
    function getAllText()
    {
      var doc=DocumentApp.getActiveDocument();
      var hdr=doc.getHeader().editAsText().getText();
      var bdy=doc.getBody().editAsText().getText();
      var ftr=doc.getFooter().editAsText().getText();
      var html=HtmlService.createHtmlOutput(hdr + bdy + ftr);
      DocumentApp.getUi().showModelessDialog(html, 'Document Text')
    }
    
    function setTableCellText()
    {
      var doc=DocumentApp.getActiveDocument();
      var resp=DocumentApp.getUi().prompt('Get childIndex,rowIndex,cellIndex and new text', 'Enter childIndex,rowIndex,cellIndex,newText' , DocumentApp.getUi().ButtonSet.OK);
      var a=resp.getResponseText().split(',');
      var childIndex=a[0];
      var rowIndex=a[1];
      var cellIndex=a[2];
      var newText=a[3];
      doc.getBody().getChild(childIndex).asTable().getCell(rowIndex, cellIndex).editAsText().setText(newText);
    }
    
    function setListItemText()
    {
      var doc=DocumentApp.getActiveDocument();
      var resp=DocumentApp.getUi().prompt('childIndex,newText', 'Enter childIndex,New Text', DocumentApp.getUi().ButtonSet.OK)
      var a=resp.getResponseText().split(',');
      var childIndex=a[0];
      var newText=a[1];
      doc.getBody().getChild(childIndex).asListItem().editAsText().setText(newText);
    }
    
    function idImageTest()
    {
      idImage(0,true);
    }
    
    function idImage(idx, up)
    {
      var up=(typeof(up)!='undefined')?up:true;
      var doc=DocumentApp.getActiveDocument();
      var images=doc.getBody().getImages();
      var img=images[idx];
      var parent=img.getParent();
      var position=doc.newPosition(parent, 0);
      doc.setCursor(position);
      var w=img.getWidth();
      var h=img.getHeight();
      if(up)
      {
        img.setWidth(w/2);
        img.setHeight(h/2);
      }
      else
      {
        Utilities.sleep(1000);
        img.setWidth(w);
        img.setHeight(h);
      }
      return idx;
    }
    
    function highLightBodyChildText(idx)
    {
      var doc=DocumentApp.getActiveDocument();
      var child=doc.getBody().getChild(idx);
      var position=doc.newPosition(child, 0);
      doc.setCursor(position);
      child.asText().editAsText().setBackgroundColor('#ffff00');
      return idx;
    }
    
    function highLightHeaderChildText(idx)
    {
      var doc=DocumentApp.getActiveDocument();
      var child=doc.getHeader().getChild(idx);
      var position=doc.newPosition(child, 0);
      doc.setCursor(position);
      child.asText().editAsText().setBackgroundColor('#ffff00');
      return idx;
    }
    function lowLightBodyChildText(idx)
    {
      Utilities.sleep(1000);
      DocumentApp.getActiveDocument().getBody().getChild(idx).asText().editAsText().setBackgroundColor('#ffffff');
    }
    function lowLightHeaderChildText(idx)
    {
      Utilities.sleep(1000);
      DocumentApp.getActiveDocument().getHeader().getChild(idx).asText().editAsText().setBackgroundColor('#ffffff');
    }
    function saveChildTableCellChanges(idx,rowidx,cellidx,text)
    {
      var doc=DocumentApp.getActiveDocument();
      var child=doc.getBody().getChild(idx);
      child.asTable().getRow(rowidx).getCell(cellidx).editAsText().setText(text);
    }
    function testnext()
    {
      setChildAttribute('FOREGROUND_COLOR',0,'#ff0000')
    }
    function setChildAttribute(key,idx,text){
      var doc=DocumentApp.getActiveDocument();
      var child=doc.getBody().getChild(idx);
      var type=child.getType();
      switch(type)
      {
        case DocumentApp.ElementType.PARAGRAPH:
          var childattrs=child.asParagraph().getAttributes();
          break;
        case DocumentApp.ElementType.LIST_ITEM:
          var childattrs=child.asListItem().getAttributes();
          break;
        case DocumentApp.ElementType.TEXT:
          var childattrs=child.asText().getAttributes();
          break;
        case DocumentApp.ElementType.TABLE:
          var childattrs=child.asTable().getAttributes();
          break;
        case DocumentApp.ElementType.TABLE_CELL:
          var childattrs=child.asTableCell().getAttributes();
          break;
        default:
          var childattrs=child.asText().getAttributes();
      }
      childattrs[key]=text;
      switch(type)
      {
        case DocumentApp.ElementType.PARAGRAPH:
          child.asParagraph().setAttributes(childattrs);
          break;
        case DocumentApp.ElementType.LIST_ITEM:
          child.asListItem().setAttributes(childattrs);
          break;
        case DocumentApp.ElementType.TEXT:
          child.asText().setAttributes(childattrs);
          break;
        case DocumentApp.ElementType.TABLE:
          child.asTable().setAttributes(childattrs);
          break;
        case DocumentApp.ElementType.TABLE_CELL:
          child.asTableCell().setAttributes(childattrs);
          break;
        default:
          child.asText().setAttributes(childattrs);
      }
      var id='#childAttr' + key + idx;
      var a=[];
      a.push(id);
      a.push(text);
      a.push(type);
      return a;
    }
    function setThisElementAttribute(key,idx,rowidx,cellidx,text)
    {
      var doc=DocumentApp.getActiveDocument();
      var child=doc.getBody().getChild(idx);
      var cellAttrs=child.asTable().getRow(rowidx).getCell(cellidx).editAsText().getAttributes();
      cellAttrs[key]=text;
      child.asTable().getRow(rowidx).getCell(cellidx).editAsText().setAttributes(cellAttrs);
      var id='#Attr' + key + idx + rowidx + cellidx;
      var a=[];
      a.push(id);
      a.push(text);
      return a;
    }
    function setSelectedElementAttribute(key, idx, text)
    {
      var doc=DocumentApp.getActiveDocument();
      var selection=doc.getSelection();
      var selectedElements=selection.getRangeElements();
      var el=selectedElements[idx].getElement();
      var eltype=el.getType();
      switch(eltype)
      {
        case DocumentApp.ElementType.TEXT:
          var elattrs=el.asText().getAttributes();
          break;
        default:
          var elattrs=el.asText().getAttributes();
          break;
      }
      elattrs[key]=text;
      switch(eltype)
      {
        case DocumentApp.ElementType.TEXT:
          el.asText().setAttributes(elattrs);
          break;
        default:
          el.asText().setAttributes(elattrs);
          break;
      }
      var id='#elattr' + key + idx;
      var a=[];
      a.push(id);
      a.push(text);
      a.push(eltype);
      return a;
    }
    function loadFile(filename,folderID)
    {
      var filename = (typeof(filename) !== 'undefined')? filename : 'SampleData';
      var folderID = (typeof(folderID) !== 'undefined')? folderID : '0Bx2ds1-a4A5nMS1GRHh6N3NEQXc';
      var fldr = DriveApp.getFolderById(folderID);
      var file = fldr.getFilesByName(filename);
      var s = '';
      while(file.hasNext())
      {
        var fi = file.next();
        var target = fi.getName();
        if(target == filename)
        {
          s = fi.getBlob().getDataAsString();
        }
      }
      return s;
    }
    
        function getRevisionHistory()
        {
          var s='';
          var br='<br />';
          var doc=DocumentApp.getActiveDocument();
          var id=doc.getId();
          var revisions=Drive.Revisions.list(id);
          if (revisions.items && revisions.items.length > 0) 
          {
            for (var i = 0; i < revisions.items.length; i++) 
            {
              var revision = revisions.items[i];
              var date = new Date(revision.modifiedDate); 
              s+=br + Utilities.formatString('ID: %s, Date: %s <a href="%s" target="_blank">Link</a>', revision.id, date.toLocaleString(), revision.selfLink);
              //Logger.log('ID: %s, Date: %s', revision.id, date.toLocaleString());
            }
          } 
          else 
          {
            //Logger.log('No revisions found.');
            s+=br + 'No revisions found.';
          }
          if(s)
          {
            DocumentApp.getUi().showModelessDialog(HtmlService.createHtmlOutput(s), 'Document History for ' + doc.getName());
          }
        }

lookinInside.gs:

    function lookinInside()
    {
      var br = '<br />';
      var s='';
      var doc = DocumentApp.getActiveDocument();
      var header = doc.getHeader();
      if(header)
      {
        s+=br + '<h3>Document Header</h3>';
        var headerchildren = header.getNumChildren();
        if(headerchildren)
        {
          var headerattrs = header.getAttributes();
          s+=br + '<strong>Header Attributes</strong>';
          s+=br + '<div id="hdr1" style="display:none;">';
          for(var key in headerattrs)
          {
            s+= br + key + ' = ' + headerattrs[key];
          }
          s+='</div><a href="#hdr1" onClick="toggleDiv(\'hdr1\')">Show/Hide</a>';
          var headertxt=header.editAsText().getText();
          var headertype=header.getType();
          if(headertxt)
          {
            s+=br + '<strong>Header Type:</strong>' + headertype;
            s+=br + '<strong>Header Text:</strong>';
            s+=br + '<span style="color:#ff0000;font-size:14px;">' + headertxt + '</span>';
            s+=br + '<strong>Text Length:' + headertxt.length + '</strong>';
          }
          else
          {
            s+=br + '<strong>Header Type: </strong>' + headertype;
            s+=br + '<strong>No Header Text for this document.</strong>';
          }
          s+=br + '<strong>Number of Children = ' + headerchildren + '</strong>';
          s+=br + '<strong>Header Children Types</strong>'; 
          s+='<hr width="100%"/>';
          for(var i=0;i<headerchildren;i++)
          {
            var child = header.getChild(i);
            if(child)
            {
              var type = child.getType();
              var childtxt = child.asText().getText(); 
              if(childtxt)
              {
                s+=br + '<strong>' + 'Child[' + i + ']= ' + type + '</strong>';
                s+=br + '<strong>' + 'Text = '  + '</strong>' + '<span style="color:#ff0000;font-size:14px;">' + childtxt + '</span>';
                s+=br + '<strong>' + 'Text Length = ' + childtxt.length + '</strong>';
                s+=br + '<input id="hdrchildfind' + i + '"type="button" value="Click to Find Text" onClick="hlHeaderChildText(' + i + ')" />';
              }
              else
              {
                s+=br + '<strong>' + 'Child[' + i + ']= ' + type + '</strong>';
                s+=br + '<strong>No Header Child[' + i + '] text.</strong>'}
              var childattrs = child.getAttributes();
              if(childattrs)
              {
                s+= br + '<strong>Child[' + i + '] Attributes</strong>';
                s+=br + '<div id="hdrchild' + i + '" style="display:none;">';
                for(var key in childattrs)
                {
                  s+=br + key + ' = ' + childattrs[key];
                }
                s+='</div><a href="#hdrchild' + i + '" onClick="toggleDiv(\'hdrchild' + i + '\')">Show/Hide</a>';
              }else{s+=br + '<strong>No Header Child[' + i + '] attributes.</strong>';}
              s+='<hr width="100%"/>';
            }else{s+=br + '<strong>No ' + i + 'th Header Child</strong>';}
          }
        }else{s+=br + '<strong>No Header Children in this header.</strong>';}
      }else{s+=br + '<h3>No Header Element in this document</h3>';}
      var body = doc.getBody();
      if(body)
      {
        s+=br + '<h3>Document Body</h3>';
        var bodychldrn = body.getNumChildren();
        if(bodychldrn)
        {
          var bodyattrs = body.getAttributes();
          if(bodyattrs)
          {
            s+=br + '<strong>Body Attributes</strong>';
            s+=br + '<div id="bdy1" style="display:none;">';
            for(var key in bodyattrs)
            {
               s+= br + key + ' = ' + bodyattrs[key];
            }
            s+='</div><a href="#bdy1" onClick="toggleDiv(\'bdy1\')">Show/Hide</a>';
          }else{s+=br + '<strong>No Body Attributes</strong>';}
          var bodytxt = body.editAsText().getText();
          if(bodytxt)
          {
            s+=br + '<strong>Body Text:</strong>';
            s+=br + '<span style="color:#ff0000;font-size:14px;">' + body.editAsText().getText() + '</span>';
            s+=br + '<strong>Text Length = </strong>' + body.editAsText().getText().length;
            s+=br + '<strong>Number of Children = ' + bodychldrn + '</strong>';
            s+=br + '<strong>Body Children Types</strong>'; 
          }else{s+=br + '<strong>No Body Text</strong>';}
          s+='<hr width="100%"/>';
          for(var i=0;i<bodychldrn;i++)
          {
            var child = body.getChild(i);
            if(child)
            {
              var type = child.getType();
              var childtxt = child.asText().getText(); 
              if(childtxt)
              {
                s+=br + '<strong>' + 'Child[' + i + ']= ' + type + '</strong>';
                s+=br + '<strong>' + 'Text = '  + '</strong>' + '<span style="color:#ff0000;font-size:14px;">' + childtxt + '</span>';
                s+=br + '<strong>' + 'Text Length = ' + childtxt.length + '</strong>';
                s+=br + '<input id="txtfind' + i + '"type="button" value="Click to Find Text" onClick="hlBodyChildText(' + i + ')" />';
              }
              else
              {
                s+=br + '<strong>' + 'Child[' + i + ']= ' + type + '</strong>';
                s+=br + '<strong>No text in body child[' + i + '].</strong>'; 
               }
               switch(type)
               {
                 case DocumentApp.ElementType.PARAGRAPH:
                   var childattrs=child.asParagraph().getAttributes();
                   break;
                 case DocumentApp.ElementType.LIST_ITEM:
                   var childattrs=child.asListItem().getAttributes();
                   break;
                 case DocumentApp.ElementType.TEXT:
                   var childattrs=child.asText().getAttributes();
                   break;
                 case DocumentApp.ElementType.TABLE:
                   var childattrs=child.asTable().getAttributes();
                   break;
                 case DocumentApp.ElementType.TABLE_CELL:
                   var childattrs=child.asTableCell().getAttributes();
                   break;
                 default:
                   var childattrs=child.asText().getAttributes();
              }
              if(childattrs)
              {
                s+= br + '<strong>Child[' + i + '] Attributes</strong>';
                s+=br + '<div id="bdychild' + i + '" style="display:none;">';
                for(var key in childattrs)
                {
                  s+=br + '<strong>' + key + '</strong>' + ' = ' + childattrs[key];
                  s+=br + '<input type="text" value="' + childattrs[key] +  '" id="childAttr' + key + Number(i) + '" />';
                  s+=br + '<input id="childattrbtn' + Number(i) + '" type="button" value="Save Changes" onClick="setChildAttribute(\'' + key + '\',' + i + ');" />'
                }
                s+='</div><a href="#bdychild' + i + '" onClick="toggleDiv(\'bdychild' + i + '\')">Show/Hide</a>';
              }else{s+=br + '<strong>No  child attributes for child[' + i + '].</strong>';}
              s+='<hr width="100%"/>';
              if(type==DocumentApp.ElementType.TABLE)
              {
                var numrows = child.asTable().getNumRows();
                for(var j=0;j<numrows;j++)
                {
                  var numcells=child.asTable().getRow(j).getNumCells();
                  for(var k=0;k<numcells;k++)
                  {
                    var celltxt=child.asTable().getRow(j).getCell(k).editAsText().getText();
                    var cellAttrs=child.asTable().getRow(j).getCell(k).editAsText().getAttributes();
                    if(cellAttrs)
                    {
                      s+= br + '<strong>Child[' + i + '] ' + 'Row[' + j + ']' + ' Cell[' + k + ']'  + ' Attributes</strong>';
                      s+=br + '<div id="cell' + Number(i) + Number(j) + Number(k) + '" style="display:none;">';
                      for(var key in cellAttrs)
                      {
                        s+=br + '<strong>' + key + '</strong>' + ' = ' + cellAttrs[key];
                        s+=br + '<input type="text" value="' + cellAttrs[key] +  '" id="Attr' + key + Number(i) + Number(j) + Number(k) + '" />';
                        s+=br + '<input id="cellattrbtn' + Number(i) + Number(j) + Number(k) + '" type="button" value="Save Changes" onClick="setThisElementAttribute(\'' + key + '\',' + i + ',' + j + ',' + k + ');" />'
                      }
                      s+='</div><a href="#cell' + Number(i) + Number(j) + Number(k) + '" onClick="toggleDiv(\'cell' + Number(i) + Number(j) + Number(k) + '\')">Show/Hide</a>';
                    }else{s+=br + '<strong>No  child attributes for cell' + Number(i) + Number(j) + Number(k) + '.</strong>';}
                    //s+=br + '<strong>Cell[' + j + '][' + k + ']= </strong>' + '<span style="color:#ff0000;font-size:14px;font-weight:bold;">' + celltxt + '</span>';
                    s+=br + '<strong>Cell[' + j + '][' + k + '] </strong>' + '<input id="celltxt' + i + '-' + j + '-' + k + '" type="text" value="' + celltxt + '" size="25"/>';
                    s+=br + '<input id="cellbtn' + j + '-' + k + '" type="button" value="' + 'Save Changes' + '" onClick="saveChildTableCellChanges(' + i + ',' + j + ',' + k + ');" />';
                    s+='<hr width="100%"/>';
                  }
                }
                s+='<hr width="100%"/>';
              }
            }else{s+=br + '<strong>No ' + i + 'th Child in this document body.</strong>';}
          }
        }else{s+=br + '<strong>No Body Children in this document.</strong>';}
        var images=body.getImages();
        if(images)
        {
          s+=br + '<strong>Body Images</strong>' + br + '<strong>Number of Images: </strong> ' + images.length;
          s+='<hr width="100%"/>';
          for(var i=0;i<images.length;i++)
          {
            var imgattrs=images[i].getAttributes();
            if(imgattrs)
            {
              s+=br + '<strong>Image[' + i + ']: Attributes</strong>';
              for(var key in imgattrs)
              {
                s+=br + '<strong>' + key + '</strong>= ' + imgattrs[key];
              }
            }else{s+=br + '<strong>No image attributes for Image[' + i + ']';}
            s+=br + '<input id="imgfind' + i + '" type="button" value="Click to Find Image" onClick="shoot(' + i + ');" />';
            s+='<hr width="100%"/>';
          }
        }else{s+=br + '<strong>No Images in this Body element.</strong>';}
        
      }else{s+=br + '<strong>No body in this document.</strong>';}
      var footer = doc.getFooter();
      if(footer)
      {
        s+=br + '<h3>Document Footer</h3>';
        var footerattrs = footer.getAttributes();
        if(footerattrs)
        {
          s+=br + '<strong>Footer Attributes</strong>';
          s+=br + '<div id="ftr1" style="display:none;">';
          for(var key in footerattrs)
          {
            s+= br + key + ' = ' + footerattrs[key];
          }
          s+='</div><a href="#ftr1" onClick="toggleDiv(\'footer1\')">Show/Hide</a>';
        }else{s+=br + '<strong>No footer attributes for the footer in this document.</strong>';}
        var footertxt=footer.editAsText().getText();
        var footertype=footer.getType();
        if(footertxt)
        {
          s+=br + '<strong>Footer Type: </strong>' + footertype;
          s+=br + '<strong>Footer Text: </strong>';
          s+=br + '<span style="color:#ff0000;font-size:14px;">' + footertxt + '</span>';
        }
        else
        {
          s+=br + '<strong>Footer Type: </strong>' + footertype;
          s+=br + '<strong>No Footer Text</strong>';
        }
        var footerchildren = footer.getNumChildren();
        s+='<hr width="100%"/>';
        if(footerchildren)
        {  
          s+=br + '<strong>Number of Children = ' + footerchildren + '</strong>';
          s+=br + '<strong>Footer Children Types</strong>'; 
          for(var i=0;i<footerchildren;i++)
          {
            var child = footer.getChild(i);
            var type = child.getType();
            var childtxt = child.asText().getText(); 
            if(childtxt)
            {
              s+=br + '<strong>' + 'Child[' + i + ']= ' + type + '</strong>';
              s+=br + '<strong>' + 'Text = '  + '</strong>' + '<span style="color:#ff0000;font-size:14px;">' + childtxt + '</span>';
              s+=br + '<strong>' + 'Text Length = ' + childtxt.length + '</strong>';
            }
            else
            {
              s+=br + '<strong>' + 'Child[' + i + ']= ' + type + '</strong>';
              s+='<strong>No Footer Child[' + i + '] text.</strong>';
            }
            var childattrs = child.getAttributes();
            if(childattrs)
            {
              s+= br + '<strong>Child[' + i + '] Attributes</strong>';
              s+=br + '<div id="ftrchild' + i + '" style="display:none;">';
              for(var key in childattrs)
              {
                s+=br + '<strong>' + key + '</strong>' + ' = ' + childattrs[key];
              }
              s+='</div><a href="#ftrchild' + i + '" onClick="toggleDiv(\'ftrchild' + i + '\')">Show/Hide</a>';
            }else{s+=br + '<strong>No Footer Child[' + i + '] attributes.</strong>';}
            s+='<hr width="100%"/>';
          }
        }else{s+=br + '<strong>No Footer children for the footer in this document.</strong>';}
       }else{s+=br + '<h3>No Footer Element in this Document</h3>';}
      s+='<input type="button" value="Exit" onClick="google.script.host.close();" />';
      var html=HtmlService.createHtmlOutputFromFile('htmlToBody').setTitle('Looking Inside').setWidth(500).setHeight(450);
      DocumentApp.getUi().showSidebar(html.append(s));
    }

Highlight.gs:

    function highLightCurrentSelection()
    {
      var conclusionStyle = {};
          conclusionStyle[DocumentApp.Attribute.BACKGROUND_COLOR]='#ffffff';
          conclusionStyle[DocumentApp.Attribute.FOREGROUND_COLOR]='#000000';
          conclusionStyle[DocumentApp.Attribute.FONT_FAMILY]='Calibri';
          conclusionStyle[DocumentApp.Attribute.FONT_SIZE]=20;
          conclusionStyle[DocumentApp.Attribute.BOLD]=false;
          conclusionStyle[DocumentApp.Attribute.HORIZONTAL_ALIGNMENT]=DocumentApp.HorizontalAlignment.LEFT;
          conclusionStyle[DocumentApp.Attribute.VERTICAL_ALIGNMENT]=DocumentApp.VerticalAlignment.BOTTOM;
          conclusionStyle[DocumentApp.Attribute.LINE_SPACING]=1.5;
          conclusionStyle[DocumentApp.Attribute.HEIGHT]=2;
          conclusionStyle[DocumentApp.Attribute.LEFT_TO_RIGHT]=true;
      var br = '<br />';
      var selection = DocumentApp.getActiveDocument().getSelection();
      var s='';
      if(selection)
      {
        s+=br + '<strong>Elements in Current Selection</strong>';
        var selectedElements = selection.getRangeElements();
        for(var i=0;i<selectedElements.length;i++)
        {
          var selElem = selectedElements[i];
          var el = selElem.getElement();
          var isPartial = selElem.isPartial();
          if(isPartial)
          {
            var selStart = selElem.getStartOffset();
            var selEnd = selElem.getEndOffsetInclusive();
            s+=br + 'isPartial:true selStart=' + selStart + ' selEnd=' + selEnd ;
            var bgcolor = (el.asText().getBackgroundColor(selStart)=='#ffff00')?'#ffffff':'#ffff00';
            el.asText().setBackgroundColor(selStart, selEnd, bgcolor)
          }
          else
          {
            var selStart = selElem.getStartOffset();
            var selEnd = selElem.getEndOffsetInclusive();
            s+=br + 'isPartial:false selStart=' + selStart + ' selEnd=' + selEnd ;
            var bgcolor = (el.asText().getBackgroundColor()=='#ffff00')?'#ffffff':'#ffff00';
            el.asText().setBackgroundColor(bgcolor);
          }
          var elType=el.getType();
          s+=br + 'selectedElement[' + i + '].getType()= ' + elType;
          if(elType==DocumentApp.ElementType.TEXT)
          {
            var txt = selElem.getElement().asText().getText();
            var elattrs = el.getAttributes();
            if(elattrs)
            {
              s+=br + 'Type:<strong>TEXT</strong>';
              s+=br + 'Text:<span style="color:#ff0000">' + txt + '</span>';
              s+=br + 'Length: ' + txt.length;
              s+=br + '<div id="sel' + Number(i) + '" style="display:none;">';
              for(var key in elattrs)
              {
                 s+= br + '<strong>' + key + '</strong>' + ' = ' + elattrs[key];
                 s+=br + '<input type="text" value="' + elattrs[key] +  '" id="elattr' + key + Number(i) + '" />';
                 s+=br + '<input id="elattrbtn' + Number(i) + '" type="button" value="Save Changes" onClick="setSelectedElementAttribute(\'' + key + '\',' + i + ');" />'
              }
              s+='</div><a href="#sel' + Number(i) + '" onClick="toggleDiv(\'sel' + Number(i) + '\')">Show/Hide</a>';
            }
          }
          if(elType==DocumentApp.ElementType.PARAGRAPH)
          {
            var txt = selElem.getElement().asParagraph().getText();
            var elattrs = el.getAttributes();
            if(elattrs)
            {
              s+=br + '<strong>PARAGRAPH Attributes</strong>';
              s+=br + 'Text:<span style="color:#ff0000">' + txt + '</span> Text Length= ' + txt.length;
              for(var key in elattrs)
              {
                s+= br + key + ' = ' + elattrs[key];
              }
            }
          }
          s+='<hr width="100%"/>';
        }
         var finalP=DocumentApp.getActiveDocument().getBody().appendParagraph('Total Number of Elements: ' + Number(selectedElements.length));
         finalP.setAttributes(conclusionStyle);
      }
      else
      {
        s+= br + 'No Elements found in current selection';
      }
      s+='<input type="button" value="Toggle HighLight" onclick="google.script.run.highLightCurrentSelection();"/>';
      //s+='<input type="button" value="Exit" onClick="google.script.host.close();" />';
      DocumentApp.getUi().showSidebar(HtmlService.createHtmlOutputFromFile('htmlToBody').append(s).setWidth(800).setHeight(450).setTitle('Selected Elements'));
    }

temp.gs

    function dispImage()
    {
      var html=HtmlService.createHtmlOutputFromFile('image');
      DocumentApp.getUi().showModelessDialog(html, 'Display Image')
    }
    
image.html

    <!DOCTYPE html>
    <html>
      <head>
        <base target="_top">
      </head>
      <body>
        <img src="https://drive.google.com/uc?id=0Bx2ds1-a4A5nRXpDdDhlNDhCd28&export=download" width="200" />
        <img src="http://drive.google.com/uc?export=view&id=0Bx2ds1-a4A5nRXpDdDhlNDhCd28" width="200" />
        <img src="https://drive.google.com/uc?id=0Bx2ds1-a4A5nRXpDdDhlNDhCd28" width="200" />
        
      </body>
    </html>
    
htmlToBody.html

    <!DOCTYPE html>
    <html>
        <head>
            <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
            <script>
            function toggleDiv(id) {
                var div = document.getElementById(id);
                div.style.display = div.style.display == "none" ? "block" : "none";
            }
            function shoot(i) {
                google.script.run.withSuccessHandler(reBound).idImage(i);
            }
            function reBound(i) {
                google.script.run.idImage(i, false);
            }
            function hlHeaderChildText(idx){
                google.script.run.withSuccessHandler(llHeaderChildText).highLightHeaderChildText(idx);
            }
            function llHeaderChildText(idx){
              google.script.run.lowLightHeaderChildText(idx);
            }
            function hlBodyChildText(idx) {
                google.script.run.withSuccessHandler(llBodyChildText).highLightBodyChildText(idx);
            }
            function llBodyChildText(idx) {
                google.script.run.lowLightBodyChildText(idx);
            }
            function saveChildTableCellChanges(idx, rowidx, cellidx) {
                var str = '#celltxt' + idx + '-' + rowidx + '-' + cellidx;
                var text = $(str).val();
                google.script.run.saveChildTableCellChanges(idx, rowidx, cellidx, text);
            }
            function setChildAttribute(key, idx){
              var str='#childAttr' + key + Number(idx);
              var text = $(str).val();
              $(str).css('background-color','#ffffff');
              google.script.run
                    .withSuccessHandler(updateChildAttribute)
                    .setChildAttribute(key,idx,text);
               console.log(key + ',' + text);
            }
            function updateChildAttribute(a){
               var id=a[0];
               var text=a[1];
               var type=a[2];
               console.log(id + ',' + text + ',' + type)
               $(id).val(text);
               $(id).css('background-color','#ffff00');
            }
            function setThisElementAttribute(key,idx, rowidx, cellidx){
                var str='#Attr' + key + idx + rowidx + cellidx;  
                var text = $(str).val();
                google.script.run
                    .withSuccessHandler(updateThisElementAttributeValue)
                    .setThisElementAttribute(key,idx,rowidx,cellidx,text);
            }
            function updateThisElementAttributeValue(a){
               var id=a[0];
               var text=a[1];
               $(id).val(text);
            }
            function setSelectedElementAttribute(key, idx){
              var str='#elattr' + key + Number(idx);
              var text = $(str).val();
              $(str).css('background-color','#ffffff');
              google.script.run
                    .withSuccessHandler(updateSelectedElementAttribute)
                    .setSelectedElementAttribute(key,idx,text);
              console.log(key + ',' + text);
            }
            function updateSelectedElementAttribute(a){
              var id=a[0];
              var text=a[1];
              var type=a[2];
              console.log(id + ',' + text + ',' + type)
              $(id).val(text);
              $(id).css('background-color','#ffff00');
            }
            
            console.log('My Code');
            </script>
        </head>
        <body width="100%">

test.gs

    function findMyTables() 
    {
      var doc=DocumentApp.getActiveDocument();
      var body=doc.getBody();
      var br='<br />';
      var s='';
      if(body)
      {
        var numChildren=body.getNumChildren();
        for(var i=0;i<numChildren;i++)
        {
          var child=body.getChild(i);
          if(child.getType()==DocumentApp.ElementType.TABLE)
          {
            s+=br + 'ChildIndex = ' + i;
            s+=br + 'Cell[row index][column index] ';
            var numrows = child.asTable().getNumRows();
            for(var j=0;j<numrows;j++)
            {
              var numcells=child.asTable().getRow(j).getNumCells();
              for(var k=0;k<numcells;k++)
              {
                var celltxt=child.asTable().getCell(j, k).editAsText().getText();
                s+=br + '<strong>Cell[' + j + '][' + k + ']= </strong>' + '<span style="color:#ff0000;font-size:14px;font-weight:bold;">' + celltxt + '</span>';
              }
            }
          }
        }
      }
      var html=HtmlService.createHtmlOutput(s).setWidth(600).setHeight(450);
      DocumentApp.getUi().showModelessDialog(html, 'My Tables')
    }

style.gs

    var conclusionStyle = {};
          conclusionStyle[DocumentApp.Attribute.BACKGROUND_COLOR]='#ffffff';
          conclusionStyle[DocumentApp.Attribute.FOREGROUND_COLOR]='#000000';
          conclusionStyle[DocumentApp.Attribute.FONT_FAMILY]='Calibri';
          conclusionStyle[DocumentApp.Attribute.FONT_SIZE]=20;
          conclusionStyle[DocumentApp.Attribute.BOLD]=false;
          conclusionStyle[DocumentApp.Attribute.HORIZONTAL_ALIGNMENT]=DocumentApp.HorizontalAlignment.LEFT;
          conclusionStyle[DocumentApp.Attribute.VERTICAL_ALIGNMENT]=DocumentApp.VerticalAlignment.BOTTOM;
          conclusionStyle[DocumentApp.Attribute.LINE_SPACING]=1.5;
          conclusionStyle[DocumentApp.Attribute.HEIGHT]=2;
          conclusionStyle[DocumentApp.Attribute.LEFT_TO_RIGHT]=true;
          
InsertParagraph.html

    <!DOCTYPE html>
    <html>
      <head>
        <base target="_top">
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
      <script>
        $(function() {
            $('#txt1').val('');
            google.script.run
              .withSuccessHandler(populateOptions)
              .getNumChildren();
          });
        function sendText()
        {
          var index=$('#idx1').val();
          var txt=$('#txt1').val();
          $('#txt1').css('background-color','#ffff00');
          google.script.run
            .withSuccessHandler(clearText)
            .putParagraph({'text':txt,'childIndex':index});
        }
        function clearText()
        {
          $('#txt1').val('');
          $('#txt1').css('background-color','#ffffff');
        }
        function populateOptions(max)
        {
          var max=(typeof(max)!='undefined')?max:10;
          var min = 1;
          var select = document.getElementById('idx1');
    
          for (var i = min; i<=max; i++)
          {
            var opt = document.createElement('option');
            opt.value = i;
            opt.innerHTML = i;
            select.appendChild(opt);
          }
        }
        console.log("My code");
      </script>
      </head>
      <body>
      <br />Index:<select id='idx1'><option value="0">0</option></select>
      <br />Text:<br /><textarea id="txt1" rows="12" cols="35"></textarea>
      <br /><input id="btn1" type="button" value="submit" onClick="sendText();" />
        
      </body>
    </html>
  
 insertParagraph.gs 
          
function putParagraph(paraObject) 
{
  var text=paraObject.text;
  var index=paraObject.childIndex;
  if(text && index)
  {
    DocumentApp.getActiveDocument().getBody().insertParagraph(index, text);
    return true;
  }
  else
  {
    DocumentApp.getUi().alert('Either the paragraph contents or the child Index was missing');
    return false;
  }
}

function loadParagraphSidebar()
{
  var html=HtmlService.createHtmlOutputFromFile('InsertParagraph').setTitle('Insert Paragraph');
  DocumentApp.getUi().showSidebar(html);
}

function getNumChildren()
{
  return DocumentApp.getActiveDocument().getBody().getNumChildren();
}