lib/meta/html.js
function(uri,config){
        return this._formatURI(uri,{
            fromPage:config.fromPage,
            pathRoot:config.output,
            webRoot:config.webRoot
        });
    }
function(uri,config){
        return this._formatURI(uri,{
            fromPage:config.fromPage,
            pathRoot:config.output,
            webRoot:config.webRoot
        });
    }
source map file path