How to load personal Firefox extensions permanently?
After writing your favorite Firefox extension, you must know how to load it into Firefox: Type “about:debugging” in the address bar of your Firefox browser and press enter. Click “This […]
class name before function arguments
I often see some “programming gurus” use strange advanced syntax such as this one: somefunction(\WP_Query $query) { …. } This is a piece of php code. You know, usually php […]
difference between class and pseudo-class in css
The differences between pseudo-class and ordinary class are: We can use any string for a class but we cannot use any string for a pseudo-class. Pseudo-classes are predefined. They are: […]
preventDefault, cancelBubble=true, return false, and returnValue=false
We’ve talked about the event model of javascript. Related to this topic is the usage of preventDefault(),stopPropagation , return false, returnValue=false, cancelBubble=true, which is very confusing. Among these, preventDefault() is […]
Difference between onclick attribute and onclick property
You may have known quite a few methods to bind a handler to the click event on an element, two of which are using the onclick attribute and the onclick […]
Are http headers case sensitive?
An http header is like: header-name:header-value The header-name is immediately followed by a colon. There can be one or more spaces between the header-value and the colon. There can be […]
elaboration of the inline element
Although it seems very easy to understand what an inline element is, I have not found an accurate definition of inline element. Somebody says inline elements are those displayed in […]
WordPress: from url to template file
When you access a url like https://myprogrammingnotes.com/category/uncategorized of a WordPress site, which file does WordPress use to serve the reply? Do not think there is a file called uncategorized that […]
css border corner joint and cut
css border property seems easy to use. “border:1px solid red;” will draw a border of 1-pixel thick solid red color around a block. But think a little further, you may […]
cURL error 60: SSL certificate problem: certificate has expired
WordPress has a function download_url that can download a file(such as an image) from remote site. I got this “cURL error 60: SSL certificate problem: certificate has expired” error when […]