Issue 6931 - Allow content filters for localhost

test/filterClasses.js

Index: test/filterClasses.js
===================================================================
--- a/test/filterClasses.js
+++ b/test/filterClasses.js
@@ -388,16 +388,21 @@
 
   // Check some special cases
   compareFilter(test, "#?#:-abp-properties(abc)", ["type=invalid", "text=#?#:-abp-properties(abc)", "reason=filter_elemhideemulation_nodomain"]);
   compareFilter(test, "foo.com#?#abc", ["type=elemhideemulation", "text=foo.com#?#abc", "selectorDomains=foo.com", "selector=abc", "domains=foo.com"]);
   compareFilter(test, "foo.com#?#:-abp-foobar(abc)", ["type=elemhideemulation", "text=foo.com#?#:-abp-foobar(abc)", "selectorDomains=foo.com", "selector=:-abp-foobar(abc)", "domains=foo.com"]);
   compareFilter(test, "foo.com#?#aaa :-abp-properties(abc) bbb", ["type=elemhideemulation", "text=foo.com#?#aaa :-abp-properties(abc) bbb", "selectorDomains=foo.com", "selector=aaa :-abp-properties(abc) bbb", "domains=foo.com"]);
   compareFilter(test, "foo.com#?#:-abp-properties(|background-image: url(data:*))", ["type=elemhideemulation", "text=foo.com#?#:-abp-properties(|background-image: url(data:*))", "selectorDomains=foo.com", "selector=:-abp-properties(|background-image: url(data:*))", "domains=foo.com"]);
 
+  // Support element hiding emulation filters for localhost (#6931).
+  compareFilter(test, "localhost#?#:-abp-properties(abc)", ["type=elemhideemulation", "text=localhost#?#:-abp-properties(abc)", "selectorDomains=localhost", "selector=:-abp-properties(abc)", "domains=localhost"]);
+  compareFilter(test, "localhost,~www.localhost#?#:-abp-properties(abc)", ["type=elemhideemulation", "text=localhost,~www.localhost#?#:-abp-properties(abc)", "selectorDomains=localhost", "selector=:-abp-properties(abc)", "domains=localhost|~www.localhost"]);
+  compareFilter(test, "~www.localhost,localhost#?#:-abp-properties(abc)", ["type=elemhideemulation", "text=~www.localhost,localhost#?#:-abp-properties(abc)", "selectorDomains=localhost", "selector=:-abp-properties(abc)", "domains=localhost|~www.localhost"]);
+
   test.done();
 };
 
 exports.testEmptyElemHideDomains = function(test)
 {
   let emptyDomainFilters = [
     ",##selector", ",,,##selector", "~,foo.com##selector", "foo.com,##selector",
     ",foo.com##selector", "foo.com,~##selector",