While every web browser is perfectly capable of interpreting baseline web syntax, some browsers are better at parsing certain arrangements of code than others. As a result of different browsers allocating computing power in their own distinct ways, more unusual and fancy web code processes can produce unintended results that may well break or otherwise defeat the purpose of those functions. It is plausible that even one of today's "mainstream" web browsers might misinterpret some parameter that its own competitors would not, thus resulting in a mishap that reflects poorly on both the website and that particular browser.
Making sure one's website is designed and tested to operate optimally on all mainline browsers and, perhaps, some obscure ones is therefore a requisite step in any web designer's procedure. A simple example of what can break on a web page depending on whichever web browser is rendering and displaying it is any element that uses a pixel-based method of determining size. Pixels are precise values that set an element's size and dimensions in a way that may make it remain awkwardly rigid despite the changing shape of the browser's window. However, if percentage values are used, it is much more likely that the elements in question will satisfactorily adjust their own dimensions to dynamically correspond to the window's shape. Another element that may not be interpreted correctly by certain browsers is a mechanically generated date; the date/time format used by MySQL might not be readable by browsers like Safari, for example.
Knowledgeable web designers make sure to include comprehensive code that can compensate for any differences posed by differently designed web browsers. Furthermore, a large fraction of all web traffic comes from mobile browsers, which tend to exist on devices with differently proportioned display screens compared to browsers running on desktop computers. This means web designers are primarily concerned with designing responsive sites that can be displayed with clarity on both wide desktop screens and narrow mobile screens. Nevertheless, there is still merit in making sure that the website also runs well on less popularly used browsers like Internet Explorer. For more information click here https://www.reddit.com/r/SEO/comments/lkhgz9/isitimportanttodesignforallthemajor/.