How to reducing spacing between paragraphs IText 7? - itext7

How can I reduce the line spacing between "Section 1" and "Alert" using IText 7?
These are values stored in the table of ​database
<h3 style=color:#0000ff;><strong>Section 1</strong></h3>
<h4><strong>- Alert</strong></h4>
I have tried without success these links because don't changing the line spacing between "Section 1" and "Alert"
https://kb.itextpdf.com/home/it7kb/faq/how-to-change-the-line-spacing-of-text
How to adjust spacing between paragraphs in iText7
My code below
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
contents = new Paragraph(dt.Rows[i]["contents"].ToString())
.SetTextAlignment(TextAlignment.JUSTIFIED)
.SetFontSize(12)
.SetMultipliedLeading(0.0f);
List<IElement> lst = HtmlConverter.ConvertToElements(dt.Rows[i]["contents"].ToString()).ToList();
for (int j = 0; j < lst.Count; j++)
{
IBlockElement element = (IBlockElement)lst[j];
if (dt.Rows[i]["contents"].ToString().StartsWith("<h3 style=color:#0000ff;><strong>Section"))
{
contents.SetFontSize(12)
.SetBold()
.SetFontColor(ColorConstants.BLUE)
.SetMultipliedLeading(0.0f);
}
else if (dt.Rows[i]["contents"].ToString().StartsWith("<h4><strong>- "))
{
contents.SetFontSize(10)
.SetBold()
.SetFontColor(ColorConstants.BLACK)
.SetMultipliedLeading(0.0f);
}
else
{
contents.SetFontSize(10)
.SetFontColor(ColorConstants.BLACK)
.SetMultipliedLeading(0.0f);
}
document.Add(element);
}
}
dest = filename.ToString();
}

You're creating a Paragraph objects (called contents) from the HTML strings and applying properties to it, but not adding those objects to the document. You're also creating a List of elements by having HtmlConverter process the HTML strings. Those elements are added to the documents.
So it's expected that none of the properties that are set on contents are visible in the PDF document.
You can simply rely on HtmlConverter to process the CSS properties.
String[] htmls = {
"<h3 style=\"color:#0000ff;\"><strong>Section 1</strong></h3>",
"<h4><strong>- Alert</strong></h4>"
};
PdfWriter writer = new PdfWriter("SO66694693.pdf");
PdfDocument pdfDoc = new PdfDocument(writer);
Document document = new Document(pdfDoc);
for (int i = 0; i < htmls.Length; i++)
{
IList<IElement> lst = HtmlConverter.ConvertToElements(htmls[i]);
for (int j = 0; j < lst.Count; j++)
{
IBlockElement element = (IBlockElement)lst[j];
document.Add(element);
}
}
document.Close();
Output:
When adjusting the bottom margin on the first element and the top margin on the second element:
"<h3 style=\"color:#0000ff;margin-bottom: 0px;\"><strong>Section 1</strong></h3>",
"<h4 style=\"margin-top: 0px;\"><strong>- Alert</strong></h4>"
Output:
If you prefer to change the properties using SetMargin(), SetMarginBottom(), etc, instead of CSS properties, make sure you're doing that on the objects you're actually adding to the document.

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The csv data is stored in an array of strings returned by a service.
Data looks like :
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I have an editable <iframe> with the some HTML code in it. I need get all <a> tags in my range. I tried this code but it doesn't work:
var select = document.getElementById(iframe_id).contentWindow.getSelection();
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function addAnchorClass(targetFrameId) {
var targetIframe = document.getElementById(targetFrameId).contentWindow;
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var alist = range.commonAncestorContainer.getElementsByTagName("a");
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