elements to a page, thinking that HTML5-capable browsers would use them for semantic things

Posted in: #CrossBrowser #Css #Html5 #InternetExplorer

I recently added HTML5 <nav> and <footer> elements to a page, thinking that HTML5-capable browsers would use them for semantic things like navigation, while older browsers would see them as user-defined tags and apply CSS styles to them like ordinary <div> elements.

When I was working on this, I remember seeing a warning that a version or some versions of Internet Explorer didn't support user-defined tags, with a link to HTML5shiv as a possible solution. Unfortunately I don't remember where I saw it or which version/versions might be affected (which would indicate how concerned I should be about this problem).

If other common browsers share this problem, it would help to know about those too.

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@Harper822

The Can I Use? website is excellent to determine browser support for various features, including HTML5 semantic tags:
caniuse.com/html5semantic
You'll see that IE8 and below let the team down. If you need to support IE6, 7, and 8, then using the HTML5 shiv is a good idea. IE8 is still in use by roughly 7% of visitors, according to StatCounter, but that percentage may be higher for some audiences. It's worth checking your own stats if you have them and making a decision based on that.

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: Which browsers do not support user-defined tags? I recently added HTML5 <nav> and <footer> elements to a page, thinking that HTML5-capable browsers would use them for semantic things

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