What is the difference between HTML tags

div is a block element span is an inline element. This means that to use them semantically, divs should be used to wrap sections of a document, while spans should be used to wrap small portions of text, images, etc. For example: Note that it is illegal to place a block-level element within an inline element, so: …is illegal. … Read more

iframe refuses to display

It means that the http server at cw.na1.hgncloud.com send some http headers to tell web browsers like Chrome to allow iframe loading of that page (https://cw.na1.hgncloud.com/crossmatch/) only from a page hosted on the same domain (cw.na1.hgncloud.com) : You should read that : https://developer.mozilla.org/en-US/docs/Web/Security/CSP https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy

How do I vertically align text in a div?

The correct way to do this in modern browsers is to use Flexbox. See this answer for details. See below for some older ways that work in older browsers. Vertical Centering in CSShttp://www.jakpsatweb.cz/css/css-vertical-center-solution.html Article summary: For a CSS 2 browser, one can use display:table/display:table-cell to center content. A sample is also available at JSFiddle: Expand snippet … Read more

Can I force a page break in HTML printing?

Add a CSS class called “pagebreak” (or “pb”), like so: Then add an empty DIV tag (or any block element that generates a box) where you want the page break. It won’t show up on the page, but will break up the page when printing. P.S. Perhaps this only applies when using -after (and also … Read more

jQuery document.createElement equivalent?

Here’s your example in the “one” line. Update: I thought I’d update this post since it still gets quite a bit of traffic. In the comments below there’s some discussion about $(“<div>”) vs $(“<div></div>”) vs $(document.createElement(‘div’)) as a way of creating new elements, and which is “best”. I put together a small benchmark, and here … Read more