Implement update media feature.
Currently only print media is matched with 'none' value.
Fast/slow is configurable through WebPreferences with default being
'fast', currently matching all non-print screens.
https://drafts.csswg.org/mediaqueries-4/#descdef-media-update.
Fixed: 791028
Change-Id: I3aceea3bb7982005d0c12b15948d18b097bf2c04
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4280881
Commit-Queue: Daniil Sakhapov <sakhapov@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1110263}
diff --git a/css/mediaqueries/update-media-feature.html b/css/mediaqueries/update-media-feature.html
new file mode 100644
index 0000000..8064117
--- /dev/null
+++ b/css/mediaqueries/update-media-feature.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<title>CSS Media Query Test: update media feature</title>
+<link rel="help" href="https://drafts.csswg.org/mediaqueries-4/#descdef-media-update">
+<meta assert="The test is supposed to be run on fast computer displays as it will no match otherwise. The definition of fast can be found in the spec link.">
+<script type="text/javascript" src="/resources/testharness.js"></script>
+<script type="text/javascript" src="/resources/testharnessreport.js"></script>
+<script type="text/javascript" src="resources/matchmedia-utils.js"></script>
+
+<script>
+query_should_be_known("(update)");
+query_should_be_known("(update: none)");
+query_should_be_known("(update: slow)");
+query_should_be_known("(update: fast)");
+
+query_should_be_unknown("(update: ?)");
+query_should_be_unknown("(update: 10px)");
+query_should_be_unknown("(update: 0)");
+
+test(() => {
+ let match_standard = window.matchMedia("(update: fast)");
+ assert_true(match_standard.matches);
+}, "Check that update: fast always matches fast displays");
+
+test(() => {
+ let match_standard = window.matchMedia("(update: slow)");
+ assert_false(match_standard.matches);
+}, "Check that update: slow doesn't match fast displays");
+
+test(() => {
+ let match_standard = window.matchMedia("(update: none)");
+ assert_false(match_standard.matches);
+}, "Check that update: none doesn't match fast displays");
+
+test(() => {
+ let match_standard = window.matchMedia("(update)");
+ assert_true(match_standard.matches);
+}, "Check that update always matches non printing documents");
+</script>
