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-rw-r--r--content_scripts/ui_component.coffee8
1 files changed, 8 insertions, 0 deletions
diff --git a/content_scripts/ui_component.coffee b/content_scripts/ui_component.coffee
index ba141b23..5bb13496 100644
--- a/content_scripts/ui_component.coffee
+++ b/content_scripts/ui_component.coffee
@@ -7,6 +7,14 @@ class UIComponent
constructor: (iframeUrl, className, @handleMessage) ->
styleSheet = document.createElement "style"
+
+ # If this is an XML document, nothing we do here works:
+ # * <style> elements show their contents inline,
+ # * <iframe> elements don't load any content,
+ # * document.createElement generates elements that have style == null and ignore CSS.
+ # We bail here if this is the case so we're polluting the DOM to no or negative effect.
+ return unless styleSheet.style
+
styleSheet.type = "text/css"
# Default to everything hidden while the stylesheet loads.
styleSheet.innerHTML = "@import url(\"#{chrome.runtime.getURL("content_scripts/vimium.css")}\");"