accessibility validator

Brief introduction accessibility, often abbreviated as a11y, refers to accessibility and ease of use of software products, especially to the accessibility of people with disabilities such as poor eyesight. Web applications, more and more as a software PRODUCT release form. And with the rapid development of Internet applications, the ease of use of WEB applicatio

1. in a directed acyclic graph, the Accessibility query r (u, v) indicates whether there is a path between u and v. When there is a path between u and v, r (u, v) returns true, that is, u to v is reachable; otherwise, false is returned, that is, not reachable. Any directed graph can be converted to a directed acyclic graph. For details about the conversion method, see blog. csdn. netwoniu317art. 1. in a directed acyclic graph, the

1. Basic Concepts In a directed acyclic graph, R (u, v) indicates whether there is a path between u and v. When there is a path between U and V, R (u, v) returns true, that is, u to V is reachable; otherwise, false is returned, that is, not reachable. Any directed graph can be converted to a directed acyclic graph. For detailed conversion methods, see (http://blog.csdn.net/woniu317/article/details/23658301 ). After the nodes in the same strongly connected component are converted, the nodes becom

Availability (Usability)Usability is a multi-factor concept that involves easy learning, ease of use, system effectiveness, user satisfaction, and a combination of these factors with the actual use of the environment to target specific evaluations.accessibility (Accessibility)Accessibility refers to the readable and understandable nature of Web content for users with disabilities. Specifically consider the

Today, when you add the ImageView component in the authoring Android layout file, the warning pops up, prompting:[Accessibility] Missing contentdescription attribute on imageIt was strange at the time, when to add the picture related components need to set this property?And then you find the next solution, one is lazy method, one is more official methodOne, lazy method------This type of warning is set to ignore by defaultFirst step: windows-->preferen

In the development and construction of PHP Web site, user registration, message is an essential function, the user submitted information data are submitted through form form, in order to ensure the integrity of the data, security, PHP form form verification is the first link to filter data, PHP to form the data submitted to verify the various ways, Early in the general use of JavaScript to verify PHP forms, with the advent of the WEB2.0 era, taking into account the user experience, using the jqu

Validator is a verification component in the jfinal framework. It provides common verification methods in the validator class, And validator implements the interceptor interface. Therefore, validator is equivalent to an interceptor. The specific usage is as follows: For example, when logging on, check whether the user

The struts2 framework system has registered a built-in checker. You can open the xwork under the Lib package of struts2. jar package, find a default under the COM/opensymphony/xwork2/validator/validators directory. xml configuration file, which defines the built-in checker of the struts2 framework.From the struts2 configuration file, we can see that struts2 has the following built-in Checker:1 required: required. The field must have a value.Fieldname:

Web Front-end development is often referred to as availability, accessibility, and maintainability. while paying attention to these three aspects, it also puts forward a requirement on the Quality of Web Page performance, many people are concerned about how to improve webpage performance, reduce project development costs, shorten time, and improve efficiency. Availability refers to whether the product is easy to use, whether the user can complete the

One of the most important goals of your Web site is to get as many visitors as possible, but do you know the real accessibility of your site (also called accessibility)? Are color-blind visitors able to access the normal? Are all the scripts on the Web page working? Your color may look good on the whole, but can the contrast color be enough to keep the page readable? The following 12 tools are designed to a

Why is it difficult to use the validate () method of actionform to verify user input data before validator is available? 1.The validator framework comesPrepackaged with several validation routines, making the transition fromHard-coded validation logic painless. (what isHard-coded validation logic? Is it that programmers do not have to write codeLine by line to perform validation ?) Instead of coding validat

Use async-validator to compile the Form component, In front-end development, Form verification is a common function. Some ui libraries such as ant. design and Element ui both implement Form components with verification functions. Async-validator is a library that can perform asynchronous data verification. The ant. design and Element ui Form components both use async-va