The author of jsPdf made a document generator for Microsoft Word documents in Pure client-side JavaScript called DOCX.js and recommends the usage of Stephen Hardy's DOCX.js.
DOCX.js depends on JSZip and supports the writing of bold, italic, underline, strikethrough, subscript, superscript, font sizes, font color, highlights, and horizontal alignment. For reading, it supports all of the above plus embedded PNGs. Support for tables and lists (bulleted and numbered) will likely come in the future, but is not currently present.
Demo-Usage of ZerdaH's Fork:
var docDOM = document.getElementById('example');
var docObject = docx.export(docDOM, // required DOM Object
{
creator: "Creator", // optional String
lastModifiedBy: "Last person to modify", // optional String
created: new Date(), // optional Date Object
modified: new Date() // optional Date Object
});
var link = document.createElement('a');
link.appendChild(document.createTextNode("Download Link Text"));
link.title = "Download Title";
link.download = "FilenameHere.docx";
link.href = docObject.href();
document.getElementById("example").appendChild(link);