ignore "box-sizing"...

lib/single-file/doc-helper.js

@@ -284,17 +284,10 @@ this.docHelper = this.docHelper || (() => {
 	function getSize(win, imageElement) {
 		const computedStyle = win.getComputedStyle(imageElement);
 		let paddingLeft, paddingRight, paddingTop, paddingBottom, borderLeft, borderRight, borderTop, borderBottom;
-		if (computedStyle.boxSizing == "content-box") {
-			paddingLeft = 0;
-			paddingRight = 0;
-			paddingTop = 0;
-			paddingBottom = 0;
-		} else {
-			paddingLeft = getWidth("padding-left", computedStyle);
-			paddingRight = getWidth("padding-right", computedStyle);
-			paddingTop = getWidth("padding-top", computedStyle);
-			paddingBottom = getWidth("padding-bottom", computedStyle);
-		}
+		paddingLeft = getWidth("padding-left", computedStyle);
+		paddingRight = getWidth("padding-right", computedStyle);
+		paddingTop = getWidth("padding-top", computedStyle);
+		paddingBottom = getWidth("padding-bottom", computedStyle);
 		borderLeft = getWidth("border-left-width", computedStyle);
 		borderRight = getWidth("border-right-width", computedStyle);
 		borderTop = getWidth("border-top-width", computedStyle);