fallback

问题 Following the 4.3 documentation about translations (https://symfony.com/doc/4.3/translation.html#basic-translation), I'm trying to translate a page title. I don't want to fallback to anything if the translation doesn't exist for the current locale. Right now, I'm getting the default locale translation if it exists or the first translation it can find. How can I disable that? Here's my /config/packages/translation.yaml file: framework: default_locale: de translator: default_path: '%kernel

问题 After reading all day about one method or the other I am still not sure what is the best for me, all sites explain the same thing but when I want to know the things that really worries me, nobody talks about that. My case: I have almost all my images using width 100% and height to auto, and the image containers had dynamic size, for example 30vw, or 40%, etc. (not sure if in this case I still need to set height and width values in the img tag) What I need to use if I want to provide different

来源： https://stackoverflow.com/questions/57979955/what-should-i-use-instead-of-the-deprecated-onerror-attribute

来源： https://stackoverflow.com/questions/6817640/catch-any-error-in-python

问题 I have a large, dynamically generated, single page website that heavily relies on javascript. I want to have a fallback for people without javascript. Each version must have different php code, so basically I need an entirely different index page. I dont want to wrap EVERYTHING in javascript, and EVERYTHING ELSE in tags. Unless there is an easy way of doing that. What is the best way to load one page or the other depending on whether javascript is enabled or not? 回答1: First, to directly

问题 I have implemented an AJAX file uploader in HTML5 using xHR2 and File api for an internal project. We were only required to support Firefox/Safari/Chrome. I used the following links as a reference http://www.html5rocks.com/en/tutorials/file/xhr2/ http://www.html5rocks.com/en/tutorials/dnd/basics/ https://developer.mozilla.org/en-US/docs/Using_files_from_web_applications Now I am required to support Internet Explorer 10 and below. IE 10 supports XHR2 but File API support is lacking. Is there a

问题 Why the following fallback for IE color: red; does not work ? In IE7, the color is black rather than red . Live demo here HTML: <div> <span>Hello</span> </div> CSS: div { width: 200px; height: 100px; background-color: blue; text-align: center; } span { font-size: 2em; color: red; color: rgba(250, 250, 97, 0.9); } 3rd party edit The mozilla mdn on css color lists the different options for color: value CSS 2 specification: color: <value> and value can be a keyword red or rgb(255,0,0) CSS Color

问题 Why the following fallback for IE color: red; does not work ? In IE7, the color is black rather than red . Live demo here HTML: <div> <span>Hello</span> </div> CSS: div { width: 200px; height: 100px; background-color: blue; text-align: center; } span { font-size: 2em; color: red; color: rgba(250, 250, 97, 0.9); } 3rd party edit The mozilla mdn on css color lists the different options for color: value CSS 2 specification: color: <value> and value can be a keyword red or rgb(255,0,0) CSS Color

问题 If i want a image to show if this flash cannot be loaded how do i do that? <object width="574" height="143"> <param name="movie" value="/upload/attachments/1391/139130/iphone_banner.swf"> <embed src="/upload/attachments/1391/139130/iphone_banner.swf" width="574" height="143"> </embed> </object> 回答1: You could wrap the object tag in a div and apply a background-image to the div . CSS: .wrapper { background: url(path/to/image.png); } HTML: <div class="wrapper"> <object.. </div> 来源： https:/

问题 I have this layout I am working on. It strongly depends on CSS calc to do the necessary calculations. width: -webkit-calc(50% - 20px); width: -moz-calc(50% - 20px); width: calc(50% - 20px); Now, I can't get this to work in Safari. Is there something I'm doing wrong? And also, is there a way I can introduce a fall-back mechanism for browsers that don't support it? Percentage wont do a good job, since I have to subtract the object in the middle, from the two on the side. Thanks. 回答1: The way I