behavior: screenshot: Extend viewport for fixed elements

Fixes #14, but needs a test case.

1 files changed, 20 insertions, 0 deletions

diff --git a/crocoite/data/screenshot.js b/crocoite/data/screenshot.js
new file mode 100644
index 0000000..a9a41e1
--- /dev/null
+++ b/crocoite/data/screenshot.js
@@ -0,0 +1,20 @@
+/* Find and scrollable full-screen elements and return their actual size
+ */
+(function () {
+/* limit the number of elements queried */
+let elem = document.querySelectorAll ('body > div');
+let ret = [];
+for (let i = 0; i < elem.length; i++) {
+	let e = elem[i];
+	let s = window.getComputedStyle (e);
+	if (s.getPropertyValue ('position') == 'fixed' &&
+			s.getPropertyValue ('overflow') == 'auto' &&
+			s.getPropertyValue ('left') == '0px' &&
+			s.getPropertyValue ('right') == '0px' &&
+			s.getPropertyValue ('top') == '0px' &&
+			s.getPropertyValue ('bottom') == '0px') {
+		ret.push (e.scrollHeight);
+	}
+}
+return ret; /* immediately return results, for use with Runtime.evaluate() */
+})();