Actually, no. This markup is not correct according to W3C. You should avoid using this. It is stated that the correct content for header elements is a “phrasing content“, which is phrasing elements intermixed with normal character data. In other words you can use the following convenient elements inside of a header tag in HTML5: … Read more
It’s deprecated in HTML 4 http://www.w3.org/TR/REC-html40/present/graphics.html#edef-U so won’t validate. Use styles instead. Maybe a <span> tag. Although, if you want the thing you’re trying to add an underline to, to be emphasized without styles enabled. Use an <em> tag and use CSS to give it an underline.
You could use the hCard Microformat to describe your address. The advantage of Microformats is that you can use them in your existing documents to enrich them. Here’s an example derived from the example from the Microformats wiki: <address class=”vcard”> <span class=”adr”> <span class=”street-address”>169 University Avenue</span> <span class=”locality”>Palo Alto</span>, <abbr class=”region” title=”California”>CA</abbr> <span class=”postal-code”>94301</span> <span … Read more
While it’s true that the W3C’s HTML spec does not define it, there is an allowTransparency attribute, and it is supported by all modern browsers (and Internet Explorer). As HTML5 has taught us, the cart is supposed to be before the horse. Suppose you have this HTML on your main page, index.html: <html> <body> <iframe … Read more
You can place an id=”” attribute on any element and it will have the same effect. These are typically placed on heading elements.
Does anyone know why this happens? Because Google designed it to use tag soup instead of HTML How to make this compliant? The documentation has alternative markup that is valid under the draft HTML 5 specification: <div class=”g-plusone” data-size=”standard” data-count=”true”></div> If you want it to work with HTML 4.x or XHTML 1.x then you might … Read more
I think you could use an actual space or tab directly in XML document, but if you are looking for special characters to represent them so that text processors can’t mess them up, then it’s: space =   tab = 	
See the Navigator.sendBeacon MDN documentation for further information. Create a blob to provide headers. Here is an example: window.onunload = () => { const body = { id, email, }; const headers = { type: ‘application/json’, }; const blob = new Blob([JSON.stringify(body)], headers); navigator.sendBeacon(‘url’, blob); }; navigator.sendBeacon will send a POST request with the Content-Type … Read more
From the CSS 2.1 Spec: When an inline box contains an in-flow block-level box, the inline box (and its inline ancestors within the same line box) are broken around the block-level box (and any block-level siblings that are consecutive or separated only by collapsible whitespace and/or out-of-flow elements), splitting the inline box into two boxes … Read more
This is valid HTML but invalid XHTML. There’s nothing intrinsically wrong with it. If you look at the source for Google’s privacy policy (or any of their other pages), you’ll find some much terser HTML. It does mean that your page will not be usable by an XML parser.