Between curating sites for the HTML5 gallery and answering readers’ questions here at HTML5 Doctor, I see a host of HTML5 sites and their underlying markup. In this post, I’ll show you some of the mistakes and poor markup practices I often see and explain how to avoid them.

The clinic is busy as ever with more HTML5 ills. This week, we’ll cover marking up Wikipedia infoboxes, anchors in <hgroup>, <figure> for avatars, header(s), and how to use <code> and <pre>.

The clinic is getting busy with more HTML5 ailments. This week, we’ll cover server-side validation, immutable images with <canvas>, retrieving drawn objects from a <canvas>, creating custom tags, the role attribute, and the effects of <hgroup> on SEO.

The clinic is busy as ever with more HTML5 ailments. This week, we’ll show you how (and whether) to store a <canvas> on the server, whether to use <progress> or <meter>, more on <header>, the placeholder attribute, and HTML5 minification.

The Doctor is in with another round of patient questions about HTML5. This week, we’ll cover offline viewing on requests, the drag-and-drop API, using href on any element, the <figure> element, and headings.

We’re back with more of your questions (and our answers) about HTML5. In this article, we’ll discuss using a <footer> at the top of your markup, how to skip to certain parts of a video, styling form elements and attributes, and more.

Here we are again with another round up of patient questions about HTML5. In this article, we’ll be covering a host of topics including AJAX, the eternal question of div or section, how to markup multiple blocks of content in a sidebar and using header with hgroup.

One of the new elements defined in HTML5 is <hgroup>, used for grouping titles with their associated subtitles. But why do we need <hgroup> when we’ve already got the <header> element? In this article, we’ll do our best to answer that question.

We’re back with our first round up of your questions for 2010. In this article we’ll be covering a range of topics including sections and sectioning, the img element, scaling video and a proposal for a field element.

September being one month before the HTML5 spec goes to last call in October, there’s been a few significant changes to the HTML5 spec that we wanted to briefly share with our patients.