Tag javascript
Unwanted redirect from iframe
Iframe tag allows insert to the webpage content from different URL. Browsers take care about it's isolation to avoid security risks. What a surprise when I experienced, that page in iframe redirects parent window. The evil code which can do that is: window.top.location = "http://some.url" Easy way to avoid this behavior is to use HTML5 sandbox attribute. Example: <iframe height='500px' sandbox='allow-forms allow-scripts' src='http://some.url' width='99.6%'></iframe> Caveats: sandbox side-effect is also restriction of PDF opening etc.
Javascript querySelector
The most often jQuery use-cases contain some selector. jQuery uses Sizzle library. But how can it be done in plain javascript? The cool methods are document.querySelector() and document.querySelectorAll(). Less advanced that jQuery selectors, but works default in modern browsers. More at http://www.javascriptkit.com/dhtmltutors/css_selectors_api.shtml