Modernize ui-helper-hidden-accessible

[melloware]

Based on this https://stackoverflow.com/a/62109988/502366

This jQuery style for screenreaders has not changed in a long time but now that browser have advanced it is missing some features explained in the stack overflow.

    border: 0;
    padding: 0;
    margin: 0;
    position: absolute !important;
    height: 1px; 
    width: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px); /*maybe deprecated but we need to support legacy browsers */
    clip-path: inset(50%); /*modern browsers, clip-path works inwards from each corner*/
    white-space: nowrap; /* added line to stop words getting smushed together (as they go onto seperate lines and some screen readers do not understand line feeds as a space */

[linux-foundation-easycla]

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[melloware]

Just putting this here for others...