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Nowadays, it is necessary that the teacher uses modern educational methods to achieve the best level of education. The teacher's role has changed from cued information into the guider and the facilitator of the learning process, and students search for information and results by themselves. The web technology has played a significant role in all aspects of daily life including the education process. Therefore, educational institutions use electronic learning management system, which is currently known as the e-learning systems. Such systems help to create an effective educational learning process and enhance the ability of searching and learning knowledge through the Internet. However, to ensure accessing information, procedures and services easily, websites must be designed and developed with basic standards of websites quality, which include accessibility and usability.
The term of website's accessibility refers to the possibility of the arrival of all the users to the resources that were published on the Internet. So that anyone can access the information and services provided through the web pages. Recent researchers studied the accessibility of websites to point out different recommendations on overcome such problem, such as (Alahmadi & Drew, 2016), (Baptista, Martins, Gonçalves, & Branco, 2016) and (Tashtoush, Ala'F, & Al-Sarhan, 2016). The inaccessibility of a website can take different forms, such as external links to other sites or the inability of navigation to the home page from other pages on the site (Alahmadi & Drew, 2016) (Tashtoush, Ala'F, & Al-Sarhan, 2016).
The World Wide Web Consortium (W3C) (W3C-WAI, 2005) is a network aimed at design standards for all internet users, regardless the used devices and software as well as their language, culture, location, or geographical condition. To facilitate the access of websites according to the W3C standards, and regardless of any special needs of users on the Internet, there is a need to apply a set of standards properly, so that the failure of one of these criteria will threaten accessibility.
In order to make the web more accessible W3C-Web Accessibility Initiative (WAI) (Henry, Abou-Zahra, & Brewer, 2014, April) provides a set of recommendations which allow developers to include attributes which make their Web sites easier to use by different people.
The Web Accessibility Initiative developed a set of guidelines that should be applied by the website's designers on the Internet when publishing information on the Internet, which guarantees universal access to resources available on the network. The guidelines are grouped in a series of recommendations known as WCAG (Web Content Accessibility Guidelines) (Robbins, 2006). These guidelines can be applied when developing a website to ensure its accessibility.
Usability means the ability of the website to provide consistent performance for efficiency, as well as the possibility to adapt to the user. Usability includes ease of finding information and browsing in the site in addition to ease of finding location from search engines and the availability of intelligent search methods within the website. Therefore, a website usability is a description based on several criteria, such as efficient to use, ease of learning, ease of remember, low usage error rate and pleasant to use.
Nielson in (Nielson, Usability Engineering, 1994) (Nielson, Designing Web Usability, 2000) proposed a set of guidelines for usability called Nielson usability guidelines. These guidelines became very famous and are used on many website quality studies, such as (Marrall, Burmeister, & Dillon, 2016), (Kaur, Kaur, & Kaur, 2016), (Alsabhen, 2016) and (Johnston & Brandsma, 2015).