The theme xml element (root of the theme.xml part) has a name property which is optional. However, WordsProcessing throws an exception when it doesn't find a name.

The exception is thrown because the AltChunk element is added for import, but we currently do not have implementation for importing of AltChunk elements: https://feedback.telerik.com/Project/184/Feedback/Details/190095-wordsprocessing-add-support-for-altchunk-element

Add support for importing the text values of the input element. They could be imported as a simple text to preserve the content.

When a break element is defined in the middle of a Run, DocxFormatProvider imports it at the end of the same run. For example, the following content: 

<w:r>
  <w:t>This is</w:t>
  <w:br/>
  <w:t xml:space="preserve"> a simple sentence.</w:t>
</w:r>

Results in "This is a simple sentence " + break element after it.

Currently there is no easy way to modify the properties of bookmarks and fields in the document. Think of providing API for easier manipulation.

For example, following is one of the easiest approached to change the target of hyperlinks:

                    var hyperlinkStarts = document
                        .EnumerateChildrenOfType<FieldCharacter>()
                        .Where(fc => fc.FieldCharacterType == FieldCharacterType.Start && fc.FieldInfo.Field is Hyperlink);

                    foreach (var fieldCharacter in hyperlinkStarts)
                    {
                        int indexOfCodeRun = fieldCharacter.Paragraph.Inlines.IndexOf(fieldCharacter) + 1;
                        Run hyperlinkCode = (Run)fieldCharacter.Paragraph.Inlines[indexOfCodeRun];

                        string oldUri = ((Hyperlink)fieldCharacter.FieldInfo.Field).Uri;
                        string newUri = "mailto:mail@mail.com";

                        hyperlinkCode.Text = hyperlinkCode.Text.Replace($"\"{oldUri}\"", $"\"{newUri}\"");
                        fieldCharacter.FieldInfo.UpdateField();
                    }

Run's default constructor creates it with Text = null. When document with such run is exported to PDF, NullReferenceException is thrown.

Workaround: Create the Run and immediately set its Text property to string.Emtpy.

Available in LIB Version 2018.1.423.

Applying LockAspectRatio to an image is not respected after opening the document in MS Word - the LockAspectRatio checkbox in the is not checked. An additional XML element (cNvGraphicFramePr) should be added so the UI can respect it.

When the RowSpan value is bigger than the available rows, a ArgumentOutOfRangeException is thrown while exporting the document.

Workaround: Change the value of RowSpan after importing:

foreach (var cell in document.EnumerateChildrenOfType<TableCell>())
{
    while (cell.RowSpan > cell.Row.Table.Rows.Count)
    {
        cell.RowSpan--;
    }
}

Add support for importing HTML with syntax <img style="width: 300px; height: 300px;" /> At the moment only HTML attributes are supported.

When the table borders are None, and each cell has custom set borders, when cells are merged, only borders of the cell that has <w:vMerge w:val="restart"/> are imported.

Implement support for footers in HtmlFormatProvider.

When importing documents containing pictures with references represented with the r:link attribute, ArgumentNullException is thrown.

This element serves as a frame and allows the element to be positioned as a floating element. More information about it is available in section 22.9.2.18 ST_XAlign (Horizontal Alignment Location) of Open Office XML.
DECLINED: Duplicate with - Implement support for Text Frame Properties.

In the current implementation, the parent of a hyperlink must be a paragraph. Otherwise, a NullReferenceException is thrown.

When inserting content in an empty paragraph, the styles applied to it are the default document styles. However, if the properties are present in the last paragraph symbol, the content should inherit them.

Workaround: Copy the properties of the marker after inserting the content:

run.Properties.CopyPropertiesFrom(paragraph.Properties.ParagraphMarkerProperties);