Incorrect Handling of Empty Class Attributes in SVG Parsing

[schleif]

I'm encountering an issue while parsing SVG files using node-html-parser. Specifically, when manipulating SVG elements that have a design-color attribute defined, I use node.setAttribute('fill', color); to dynamically set their fill colors.

However, when the SVG elements initially contain an empty class attribute (e.g., class=" "), the library processes these elements in such a way that the output has a malformed class attribute. Instead of maintaining class="" or removing the empty class attribute, the output contains just class without any value or quotation marks, as shown below:

Original SVG Element:
<polygon points="-235.18 1571.95 1014.73 1284.4 1083.46 1590.1 -166.45 1877.65 -235.18 1571.95" fill="#ff8200" class="" design-color="primary"></polygon>

Processed SVG Element (Incorrect):
<polygon points="-235.18 1571.95 1014.73 1284.4 1083.46 1590.1 -166.45 1877.65 -235.18 1571.95" fill="#ff8200" class design-color="primary"></polygon>

This results in parsing issues, as browsers like Safari and Chrome do not properly recognize SVG elements with class attributes formatted in this manner.

As a temporary workaround, I am explicitly setting the class attribute with a space (node.setAttribute('class', " ");) to avoid this issue. However, this is not ideal and could lead to further complications or inconsistencies in handling SVG content.

Could you please look into this issue and provide a fix or guidance on how to properly handle empty class attributes without resorting to workarounds that may not be semantically correct?

Thank you for your attention to this matter.