How to convert an HTML file to a master page in SharePoint 2013

SharePoint 2013 offers a lot of new features, so let's take a look at the ability to convert HTML pages to master pages. This feature makes it easier for designers to design Master pages and implement them in SharePoint, which is a very good feature. Come on, get to the point! ~

1, first, create a new HTML page, the effect of the following figure:

Preview Effect:

2, upload this HTML page to SharePoint, I choose to upload "master page gallery";

3, I choose as "design document" Upload, of course, you can also choose other file types;