Feature/force transparent background

src/printer.js

@@ -25,6 +25,7 @@ class Printer extends EventEmitter {
     this.allowedDomains = options.allowedDomains || [];
     this.ignoreHTTPSErrors = options.ignoreHTTPSErrors;
     this.browserWSEndpoint = options.browserEndpoint;
+    this.overrideDefaultBackgroundColor = options.overrideDefaultBackgroundColor;
 
     this.pages = [];
   }
@@ -63,6 +64,10 @@ class Printer extends EventEmitter {
 
     const page = await this.browser.newPage();
 
+    if (this.overrideDefaultBackgroundColor) {
+      page._client.send('Emulation.setDefaultBackgroundColorOverride', { color: this.overrideDefaultBackgroundColor });
+    }
+
     let uri, url, relativePath, html;
     if (typeof input === "string") {
       try {