GAMBAS BOOK 3.19.5

27.4 Component XmlHtml

The component gb.xml.html provides classes with which you can write a new HTML document or change an existing HTML document.

The component gb.xml.html from Adrien Prokopowicz has only the classes HtmlDocument and XmlElement. The class XmlElement is a reimplementation of the class XmlElement from http://gambaswiki.org/wiki/comp/gb.xml/xmlelement and is not described here → chapter 27.0 XML.

The component is based on gb.xml and the class HtmlDocument (gb.xml.html) inherits the class XmlDocument in gb.xml.

You can create an object of the class HtmlDocument. It represents an HTML document:

Dim hHtmlDocument As HtmlDocument
hHtmlDocument = New HtmlDocument ( [ FileName As String ] )

27.4.1 Properties

The class HtmlDocument has these properties:

Property	Data type	Description
All	XmlNode[]	Returns an array with all XML nodes.
Base	String	Returns the base URL used for all relative URLs contained in a document. If there is no <base> tag in the document, this property returns zero and creates a new <base> element when it is set.
Html5	Boolean	If the property is set to True, an HTML5 document is created and the document type is specified in the prologue in accordance with html5: <! DOCTYPE html>. If the property is set to False, then the document type is declared as follows: <! DOCTYPE html PUBLIC "-/W3CDTD XHTML 1.0 StrictEN""http: www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
Title	String	Sets the title for the HTML document.
Lang	String	Sets the language in the lang attribute in the document type tag.
Favicon	String	A favicon as an icon in the address line of a web browser is defined via a file path to the icon image file.
Head	XmlElement	Returns the <head> element or resets the <head> element of the document. If there is no <head> element in the document, it is created when this property is read.
StyleSheets	.HtmlDocumentStyleSheets	The virtual class has three methods, the most important of which is the add method: Sub Add (Source As String[, Media As String]. The method inserts a CSS style sheet tag into the HTML document. The default value for the optional parameter' Media' is' screen'.
Script	.HtmlDocumentScripts	The virtual class has three methods, the most important of which is the Add method: Sub Add (Source As String). The method inserts a script tag into the HTML document.
Body	XmlElement	Returns or sets the <body>-element of the document. If there is no <body> element in the document, it is created when reading this property:? https://developer.mozilla.org/de/docs/Web/HTML/Element/body.
Content	String	Returns the complete content of the HTML document in a string.

Table 27.4.1.1: Properties of the HtmlDocument class

27.4.2 Methods

The class HtmlDocument has these methods:

Method	Return type	Description
Sub Open (FileName As String)	~	Removes the entire content of this document and loads its new content from the specified file. FileName contains the file path. If the specified file is invalid or cannot be opened, an error is triggered.
GetElementById (Id As String[, Depth As Integer])	XmlElement	The function returns the element with the specified ID as an XML element. The optional parameter Depth determines the search depth.
GetElementsByTagName (TagName As String[, Mode As Integer, Depth As Integer])	XmlElement	Returns all elements of the HTML document in an array of XML elements whose tag name' TagName' matches the name in the document. The mode argument defines the comparison method used. It supports GB.Binary, GB.IgnoreCase and GB.Like. For more information, see' Predefined Constants'. The Depth argument defines where to stop the search: If a negative value is only stopped at the end of the tree (default), 1 only checks the root element, 2 only checks the direct children of the root element and so on…. .
GetElementsByClassName (ClassName As String[, Depth As Integer]	XmlElement	Returns all elements of the HTML document in an array of XML elements whose class name matches the name. The Depth argument defines where to stop the search: If a negative value is only stopped at the end of the tree (default), 1 only checks the root element, 2 only checks the direct children of the root element and so on…. .
CreateElement (TagName As String)	XmlElement	The function creates a new element' TagName'. The function value is an XML element.
FromString (Data As String)	~	Removes the existing content of the HTML document completely and loads the new content from the specified XML string. If the specified string is invalid, an error is triggered.
ToString ([ Indent As Boolean])	String	This function returns the content of the HTML document in a string that can be re-read later, for example. If the optional' Indent' parameter is set to True, the content is returned with appropriate indentations.
Save (FileName As String[, Indent As Boolean]	~	Saves the contents of the HTML document under the file path specified with FileName. If the optional' Indent' parameter is set to True, the content of the HTML document is formatted with appropriate indentations.

Table 27.4.2.1: Methods of the class HtmlDocument

27.4.3 Projects

What may be the reasons why someone should write an HTML document with the classes of the component gb. xml. html and not with the methods of the class XmlWriter, which would be obvious? One reason is that the classes of gb. xml. html are specialized in writing an HTML document. In addition, the class HtmlDocument provides you with a document of the type HtmlDocument, a DOM tree that you can build up and change specifically.

Imagine the following situation: You write a CMS similar to the DokuWiki in Gambas. At the request of a web browser, this CMS runs as a CGI script on the server and generates an HTML document from various resources, such as database data, entries from forms or data from XML files, for example, XML configuration files, according to the requested URL. Depending on which modules are loaded in your CMS, additional elements are added to the HTML page, such as an automatically generated table of contents or a visitor counter at the bottom of the page. Such a HTML page sequentially - that is, with a series of lines in the form of “sHTML &=…” It is time-consuming and costly to write, because every routine must be called at exactly the right place. How to react if you want to include a CSS or Javascript file for the visitor counter? This must be the procedure that uses the HTML header <head>..</head> assemble of course already known before! Here it is much better to use a document of the type HtmlDocument. Each resource to be included can then be attached as a new node to the places in the DOM tree where it belongs. It is no problem to add a new stylesheet to an HtmlDocument using the method HtmlDocument.stylesheets.add (…). Only when the DOM tree is complete is it converted into a (well-formed!) HTML string. As far as the use of gb. xml. html is concerned, the component impresses with the use of the' Document Object Model' (DOM). You can also search elegantly for interesting information in the DOM tree. For example, the method returns

HtmlDocument.Root.GetChildrenByFilter("a[href^=ftp://]")

as function value all link tags <a>….</a> in an array of XmlElement[] - a link list whose entries refer to an FTP server. You will find that even with a regular expression this would be much more difficult, because for example you can't rely on href being the first attribute listed in a link tag!

The presented projects show you how to use the classes of the component gb.xml.html.

27.4.3.1 Project 1

An HTML5 document is rewritten in the first project. Its content is displayed in a web browser:

Figure 27.4.3.1.1.1: Content of the HTML5 file test.html in a web browser

The source text is completely specified and then commented on:

[1] ' Gambas class file
[2]
[3] Public Sub Form_Open()
[4]   FMain.Resizable = True
[5]   FMain.Caption = "HTML5-GENERATOR"
[6]   btnHTMLShow.Enabled = False
[7] End
[8]
[9] Public Sub btnGenerateHTMLDokument_Click()
[10]   TextArea1.Clear()
[11]   TextArea1.Insert(WriteHTMLDocumentDOM().ToString(True))
[12]   SaveHTMLFile()
[13]   btnHTMLShow.Enabled = True
[14] End
[15]
[16] Public Sub btnHTMLShow_Click()
[17]   If Exist(Application.Path &/ "files/test.html") Then
[18]      Shell "firefox " & Application.Path &/ "files/test.html"
[19]   Endif
[20]   btnHTMLShow.Enabled = False
[21] End
[22]
[23] Private Sub SaveHTMLFile()
[24]   WriteHTMLDocumentDOM().Save(Application.Path &/ "files/test.html", True)
[25] End
[26]
[27] Private Function WriteHTMLDocumentDOM() As HtmlDocument
[28]
[29]   Dim hHtmlDocument As New HtmlDocument
[30]   Dim hXMLElement As XmlElement
[31]   Dim sLongText As String
[32]
[33]   sLongText = File.Load("texts/image.description.txt")
[34]
[35]   hHtmlDocument.Html5 = True
[36]   hHtmlDocument.Lang = "de"
[37]   hHtmlDocument.Title = "Test-HTML-Document"
[38]   hHtmlDocument.StyleSheets.Add("../css/main.css")
[39]   hHtmlDocument.Favicon = "../images/favicon.png"
[40]   hHtmlDocument.Scripts.Add("../scripts/datetime.js")
[41]
[42]   hHtmlDocument.Body.NewElement("h1")
[43]   hXMLElement = hHtmlDocument.GetElementsByTagName("h1", gb.IgnoreCase)[0]
[44]   hXMLElement.AppendText("Flowers in the Alps")
[45]
[46]   hHtmlDocument.Body.NewElement("hr")
[47]   hXMLElement = hHtmlDocument.GetElementsByTagName("hr", gb.IgnoreCase)[0]
[48]   hXMLElement.SetAttribute("class", "line")
[49]
[50]   hHtmlDocument.Body.NewElement("br")
[51]
[52]   hHtmlDocument.Body.NewElement("img")
[53]   hXMLElement = hHtmlDocument.GetElementsByTagName("img", gb.IgnoreCase)[0]
[54]   hXMLElement.SetAttribute("src", Application.Path &/ "images/augentrost.jpg")
[55]   hXMLElement.SetAttribute("width", "255")
[56]   hXMLElement.SetAttribute("height", "148")
[57]   hXMLElement.SetAttribute("alt", "euphrasia rostkoviana")
[58]
[59]   hHtmlDocument.Body.NewElement("p")
[60]   hXMLElement = hHtmlDocument.GetElementsByTagName("p", gb.IgnoreCase)[0]
[61]   hXMLElement.AppendText("Bildbeschreibung:")
[62]
[63]   hHtmlDocument.Body.NewElement("p")
[64]   hXMLElement = hHtmlDocument.GetElementsByTagName("p", gb.IgnoreCase)[1]
[65]   hXMLElement.AppendText(sLongText)
[66]
[67]   hHtmlDocument.Body.AppendText("Stand:")
[68]   hHtmlDocument.Body.NewElement("span")
[69]   hXMLElement = hHtmlDocument.GetElementsByTagName("span", gb.IgnoreCase)[0]
[70]   hXMLElement.SetAttribute("id", "datetime")
[71]   hXMLElement.SetAttribute("class", "id")
[72]
[73]   Return hHtmlDocument
[74]
[75] End

Comment:

The function WriteHTMLDocumentDom () in rows 27 to 74 has as function value an HTML document of type HtmlDocument.
First a new, empty Html document is created in line 29.
In line 35 an HTML5 prolog is generated.
In line 62, for example, a second paragraph tag is created in the body area and inserted into the DOM tree. This second paragraph tag is then searched in the DOM tree and assigned to an element, to which the somewhat longer image description text is then assigned as content. The element is then added to the tree in the second paragraph tag. This procedure can be found for all inserted (tag) elements.
The lines 66 to 70 represent a special feature. Here, the function value of a function (current date and time) is output in a Java script in a special range tag (span) and then formatted in css format. Attention: The (time) value is static and changes only when the HTML page is called again! Line 69 is only understandable if you read the file' datetime.js' and the section. id of the CSS file' main. css'.
The content of the HTML document is displayed in a TextArea (line 11).
Lines 23 to 25 store the finished HTML document in the project folder. A save dialog is not offered in the procedure SaveHTMLFile ().
The HTML file is displayed in the FireFox web browser in lines 16 to 21 or alternatively, you can use' Desktop. Open (“file: //” & Application. Path &/ “files/test. html”)' as a replacement for line 18 if you always want to use the current system web browser.
You could replace lines 54 to 57 with line 54* to define the three attributes. In my opinion, the first multiline variant is easier to read because you don't have to mask certain characters:

[54]  hXMLElement.SetAttribute("src", Application.Path &/ "images/augentrost.jpg")
[55]  hXMLElement.SetAttribute("width", "255")
[56]  hXMLElement.SetAttribute("height", "148")
[57]  hXMLElement.SetAttribute("alt", "euphrasia rostkoviana")
 
[54*]  hXMLElement.SetAttribute("src", Application.Path &/ "images/augentrost.jpg\" width=\"255\" height=\"148\" alt=\"euphrasia rostkoviana")

The program generates the following HTML file contents:

<!DOCTYPE html>
<html lang="de">
 <head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>
   Test-HTML-Dokument
  </title>
  <meta charset="utf-8" />
  <link rel="stylesheet" href="/home/hans/.../css/main.css" type="text/css" media="screen" />
  <link rel="icon" href="/home/hans/.../images/favicon.png" />
  <script src="/home/hans/.../scripts/datetime.js" type="text/javascript">
  </script>
 </head>
 <body>
  <h1>
   Blumen in den Alpen
  </h1>
  <hr class="line" />
  <br />
  <img src="/home/hans/.../images/augentrost.jpg" width="255" height="148" alt="Euphrasia rostkoviana" />
  <p>
   Bildbeschreibung:
  </p>
  <p>
   Augentrost oder Euphrasia rostkoviana: Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris pretium elit massa. Nulla libero est, vestibulum eu lobortis ut, pulvinar eget tortor. Fusce congue laoreet commodo. Aliquam non nisl dolor, at posuere felis. Maecenas ac tortor erat. Duis a erat lectus, sed rutrum velit. Aliquam vehicula luctus ultricies. Nam dapibus elit eget lectus tincidunt pharetra.
  </p>
  Stand:
  <span id="datetime" class="id">
  </span>
 </body>
</html>

Comment:

The specified paths are only displayed in truncated form.
Line 35 in the program source code generates an error, because two <meta> tags are generated, both of which are marked in red. Developer Adrien Prokopowicz has already fixed the bug in the developer version at: https://gitlab.com/gambas/gambas/commit/6fd076a9ef55926deee27e60a0f7f24bb4839f94
Without the first erroneous red line, the HTML validator on the website https://validator.w3. org/nu/: Document checking completed. No errors or warnings to show. Great!
The contents of the above HTML file are shown in Figure 27.4.3.3.1.1 (above).

If you are using the stable Gambas version 3.10.0 or lower, the following function can help you to create a well-formed HTML document:

Private Function WorkAround(HtmlDocument As HtmlDocument) As HtmlDocument
 
  Dim hHtmlDocument As New HtmlDocument
  Dim hXMLElement As XmlElement
 
  hHtmlDocument = HtmlDocument
  hXMLElement = hHtmlDocument.GetElementsByTagName("meta")[0] ' Get the first <meta>-Tag
' You must access the parent element to remove the specified <meta> tag
  hXMLElement.Parent.RemoveChild(hXMLElement)
 
  Return hHtmlDocument
 
End

The first <meta> tag is removed from the DOM tree. Now all you have to do is change the line 11 in the source text to the one below:

TextArea1.Insert(WriteHTMLDocumentDOM().ToString(True))
TextArea1.Insert(WorkAround(WriteHTMLDocumentDOM()).ToString(True))

Same for line 24:

WriteHTMLDocumentDOM().Save(Application.Path &/ "files/test.html", True)
WorkAround(WriteHTMLDocumentDOM()).Save(Application.Path &/ "files/test.html", True)

In Project 1, which is made available to you as an archive in the download area for testing, the necessary corrections are already made automatically depending on the used Gambas version (→ System. FullVersion).

27.4.3.2 Project 2

In the second project, the content of an existing HTML file is heavily modified. The focus is on searching for selected file contents to be changed, editing and changing these contents as well as adding the changed contents to the DOM tree. Changing also includes deleting individual HTML tags and their contents? 27.2.3 Changes to an XML document. Changes are also implemented there via the DOM tree.

For the second project, only the source code of the UpdateHTMLDocument function (sPath As String) is specified, which is extensively commented internally. Note that the following source code represents only an individual change function:

Private Function UpdateHTMLDocument(sPath As String) As HtmlDocument
 
  Dim hHtmlDocument As New HtmlDocument
  Dim hXMLElement, hExistChild, hNewChild As XmlElement
  Dim aH1, aStyle As XmlElement[]
  Dim sAttribute, sLongText, sText, sOldText, sNewText As String
  Dim iWidth, iHeight As Integer
  Dim iWH As New Integer[]
 
  sLongText = File.Load(Application.Path &/ "texts/description.txt")
' The content of the original file is written to an HTML document.
' Existing content is overwritten.
  hHtmlDocument.Open(sPath)
 
' Special case: An attribute is added to the existing <html> tag using the property .Lang.
  hHtmlDocument.Lang = "DE_de"
 
' Find and save the first <meta> tag in the head area by its name
  hExistChild = hHtmlDocument.Head.GetChildrenByTagName("meta")[0]
' Create a second <meta> tag
  hNewChild = New XmlElement("meta")
' Insert the second <meta>-Tag AFTER the first <meta>-Tag into the document tree
  hHtmlDocument.Head.InsertAfter(hExistChild, hNewChild)
' Add 2 attributes to the second <meta> tag
  hXMLElement = hHtmlDocument.Head.GetChildrenByTagName("meta")[1]
  hXMLElement.NewAttribute("name", "author")
  hXMLElement.NewAttribute("content", "Hans Lehmann - Osterburg - 2017")
' Back to the head area in the document tree
  hXMLElement = hXMLElement.Parent
 
' Find and save the second <meta> tag in the head area by its name
  hExistChild = hHtmlDocument.Head.GetChildrenByTagName("meta")[1]
' Create a third <meta> tag
  hNewChild = New XmlElement("meta")
' Insert the third <meta>-Tag AFTER the second <meta>-Tag into the document tree
  hHtmlDocument.Head.InsertAfter(hExistChild, hNewChild)
' Add 2 attributes to the third <meta> tag
  hXMLElement = hHtmlDocument.Head.GetChildrenByTagName("meta")[2]
  hXMLElement.NewAttribute("name", "description")
  hXMLElement.NewAttribute("content", "Modification and extension of an HTML-File (DOM).")
' Back to the head area in the document tree
  hXMLElement = hXMLElement.Parent
 
' Find and save the first <link> tag in the head area by its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("link")[0]
' Save the old attribute value
  sAttribute = hXMLElement.GetAttribute("href")
' Set the new attribute value
  sAttribute = "../images/favicon.ico"
' Assigning the new attribute value
  hXMLElement.SetAttribute("href", sAttribute)
 
' Make changes to CSS definitions in <style> tag (head)
' Find and save the <style> tag in the head area by its name
  aStyle = hHtmlDocument.Head.GetChildrenByTagName("style")
  If aStyle.Count > 0 Then
   ' Save CSS definitions for the <body> tag
     sText = aStyle[0].TextContent
     sOldText = "font-size: 10px"
     sNewText = "font-size: 14px"
   ' Replace font size
     sText = Replace$(sText, sOldText, sNewText)
     sOldText = "Verdana"
     sNewText = "\"DejaVu Sans Mono\""
   ' Replace font
     sText = Replace$(sText, sOldText, sNewText)
   ' Assign new CSS definitions for <body> tag
     aStyle[0].TextContent = sText
  Endif
 
' Add a (CSS color value) attribute to the <body> tag
  hHtmlDocument.Body.SetAttribute("style", "color:darkblue;")
 
' Find and save the first <h1>-Tag in the body area by its name.
  aH1 = hHtmlDocument.Body.GetChildrenByTagName("h1")
' Replace text im <h1>-Tag
  If aH1.Count > 0 Then
     aH1[0].TextContent = Replace$(aH1[0].TextContent, "/var/www", "~/public_html")
  Endif
 
' Find and save the first <img tag using its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("img")[0]
' Find and save style attribute in <img>Tag by name
  sAttribute = hXMLElement.GetAttribute("style")
' Determine and redefine the width and height of the image (normalize)
  For Each sText In Scan(sAttribute, "*:*px;*:*px")
    If IsInteger(sText) Then iWH.Add(CInteger(sText))
  Next
  If iWH[0] < 32 Or iWH[0] > 64 Then
     If (iWH[0] >= iWH[1] And iWH[0] <> 0 And iWH[1] <> 0) Then
        iWidth = 64
        iHeight = 64 * (iWH[1] / iWH[0])
     Endif
  Endif
  If iWH[1] < 32 Or iWH[1] > 64 Then
     If (iWH[1] >= iWH[0] And iWH[0] <> 0 And iWH[1] <> 0) Then
        iHeight = 64
        iWidth = 64 * (iWH[0] / iWH[1])
     Endif
  Endif
' Set new attribute value
  sAttribute = "width:" & Str(iWidth) & "px;height:" & Str(iHeight) & "px"
' Assign the new attribute value
  hXMLElement.SetAttribute("style", sAttribute)
 
' Back to body area in the document tree
  hXMLElement = hXMLElement.Parent
 
' Create a new <p> tag
  hXMLElement.NewElement("p")
' Find and save the first <p> tag by its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("p")[0]
' Insert text into the <p> tag
  hXMLElement.AppendText(sLongText)
 
' Create a new <p> tag - Variant
  hHtmlDocument.Body.NewElement("p")
' Find and save the second <p> tag by its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("p")[1]
' Insert text into the <p> tag
  hXMLElement.AppendText("An ordinary HTML-File basically consists of the following sections:")
 
' Create a new <ol> tag
  hHtmlDocument.Body.NewElement("ol")
' Find and save the first <ol> tag by its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("ol")[0]
' Add an attribute to the 1. <ol> tag
  hXMLElement.SetAttribute("style", "text-indent:2em; list-style:upper-roman")
 
' Create a new <li> tag
  hXMLElement.NewElement("li")
' Find and save the first <li> tag by its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("li")[0]
' Insert list text into the <li> tag
  hXMLElement.AppendText("Documenttyp – Deklaration/Prolog (Specification of the HTML used - Version).")
' Back to the 'ol' level in the document tree
  hXMLElement = hXMLElement.Parent
 
  hXMLElement.NewElement("li")
  hXMLElement = hHtmlDocument.GetElementsByTagName("li")[1]
  hXMLElement.AppendText("Kopf (head) - Header data such as 'title' or 'meta' details.")
  hXMLElement = hXMLElement.Parent
 
  hXMLElement.NewElement("li")
  hXMLElement = hHtmlDocument.GetElementsByTagName("li")[2]
  hXMLElement.AppendText("Körper (body) – Content as text with headings, references, graphic references ... .")
  hXMLElement = hXMLElement.Parent
 
' Create a new <p> tag
  hHtmlDocument.Body.NewElement("p")
' Find and save the third <p> tag by its name
  hXMLElement = hHtmlDocument.GetElementsByTagName("p")[2]
' Insert text into the <p> tag
  hXMLElement.AppendText("END -> LAST PARAGRAPH")
 
  Return hHtmlDocument
 
End

With the help of the above function, the content of the original HTML file with inline CSS statements:

<!DOCTYPE html>
<html>
 <head>
  <title>
   INDEX.HTML
  </title>
  <meta charset="utf-8" />
  <link rel="icon" href="../images/favicon.png" />
  <style>
   body {background-color: #C3DDFF;font-family: Verdana;font-size: 10px}
   h1 {font-family: Arial;font-size: 32px;color: blue;}
  .line {border:none; border-top:1px solid #0000FF; color:#FFFFFF; background-color: #FFFFFF; height: 1px;}
  </style>
 </head>
 <body>
   <br />
   <img src="../images/html5_logo.png" alt="HTML5" style="width:256px;height:256px">
   <br />
   <h1>
     HTML-Datei im Webordner /var/www
    </h1>
    <hr class="line"></hr>
 </body>
</html>

to an HTML5 file with modified content:

<!DOCTYPE html>
<html lang="DE_de">
 <head>
  <title>
   INDEX.HTML
  </title>
  <meta charset="utf-8" />
  <meta name="author" content="Hans Lehmann - Osterburg - 2017" />
  <meta name="description" content="Modification and extension of an HTML-File (DOM)." />
  <link rel="icon" href="../images/favicon.ico" />
  <style>
   body {background-color: #C3DDFF;font-family: &quot;DejaVu Sans Mono&quot;;font-size: 14px}
   h1 {font-family: Arial;font-size: 32px;color: blue;}
  .line {border: none; border-top: 1px solid #0000FF; color: #FFFFFF; … ; height: 1px;}
  </style>
 </head>
 <body style="color:darkblue;">
  <br />
  <img src="../images/html5_logo.png" alt="HTML5" style="width:64px;height:64px" />
  <br />
  <h1>
     HTML-File in the web folder ~/public_html
  </h1>
  <hr class="line" />
  <p>
   Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris pretium elit massa. Nulla libero est, vestibulum eu lobortis ut, pulvinar eget tortor. Fusce congue laoreet commodo. Aliquam non nisl dolor, at posuere felis. Maecenas ac tortor erat. Duis a erat lectus, sed rutrum velit. Aliquam vehicula luctus ultricies. Nam dapibus elit eget lectus tincidunt pharetra.
  </p>
  <p>
   An ordinary HTML-File basically consists of the following sections:
  </p>
  <ol style="text-indent:2em; list-style:upper-roman">
   <li>
    Documenttyp – Deklaration/Prolog (Specification of the HTML - Version is used).
   </li>
   <li>
    Head - Header data such as 'title' or 'meta' information.
   </li>
   <li>
    Körper (body) – Content as text with headings, references, graphic references ... .
   </li>
  </ol>
  <p>
   END -&gt; LAST PARAGRAPH
  </p>
 </body>
</html>

Figure 27.4.3.2.1: Content of the modified HTML file in a web browser

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