Why Google Tag Manager puts both display:none AND visibility:hidden on iframe?
问题 If you take a look at the <noscript> part of the Google Tag Manager embed code, you'll notice something like: <noscript><iframe style="display:none;visibility:hidden" src="//www.googletagmanager.com/..." height="0" width="0"></iframe></noscript> I can understand why style="display:none" would be important (it will hide the element such that it takes up zero space in the layout and yet still fetches the content) however, why add the "visibility:hidden" part? It seems to me like it adds no