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    <p>I did this using HtmlAgilityPack. Following is the code I have developed.</p> <pre><code>HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument(); doc.LoadHtml(inputHtml); var elementsWithStyleAttribute = doc.DocumentNode.SelectNodes(string.Concat("//", tagName)); if (null == elementsWithStyleAttribute) { return inputHtml; } foreach (var element in elementsWithStyleAttribute) { var classElement = element.GetAttributeValue("class", null); if (!string.IsNullOrWhiteSpace(classElement)) { // Remove class attribute. element.Attributes["class"].Remove(); } var styles = element.GetAttributeValue("style", null); if (!string.IsNullOrWhiteSpace(styles)) //&amp;&amp; (styles.ToUpper().Contains("FONT-FAMILY:") || styles.ToUpper().Contains("FONT-SIZE:"))) { element.Attributes["style"].Remove(); string[] splitter = { ";" }; string[] styleClasses = styles.Split(splitter, StringSplitOptions.None); StringBuilder sbStyles = new StringBuilder("font-family:Arial; font-size:10pt;"); if (null != styleClasses &amp;&amp; styleClasses.Length &gt; 0) { foreach (var item in styleClasses) { if (!string.IsNullOrWhiteSpace(item) &amp;&amp; !item.ToUpper().Contains("FONT-FAMILY:") &amp;&amp; !item.ToUpper().Contains("FONT-SIZE:") &amp;&amp; !item.ToUpper().Contains("FONT:")) { // Add existing styles except font size and font family styles. sbStyles.Append(item.Trim()); sbStyles.Append(";"); } } } element.SetAttributeValue("style", sbStyles.ToString()); } else { element.SetAttributeValue("style", "font-family:Arial; font-size:10pt;"); } } return doc.DocumentNode.InnerHtml; </code></pre>
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