[SYMBOL][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X][Y][Z]<a> tags, browser-specific linking using a\:active pseudoclass a\:hover pseudoclass a\:link pseudoclass a\:visited pseudoclass absolute positioning accessing substrings add-by-value operators (+=) 2nd addEventListener( ) method addition (+) operators 2nd adjustIFrameSize( ) function adjustingelement transparency positioned element stacking order allowing only numbers or text in a text box alpha filter Alt keys anchors, loading angle brackets (< >) in style sheets animatePolygon( ) function animatingcircular element paths state transitions straight-line element paths anime object animeCirc.js library animeLine.js library anonymous functions appendChild( ) method appendScrollBar( ) function Apple Macintosh, testing multiple browsers on apply( ) method Array object constructor array2String( ) function arrays 2nd of arrays, creating combining creating dividing double indexes hash table simulation for fast lookups iterating through multidimensional, creating and objects of objects, sorting sorting strings, converting to 2nd vs. objects ASCII character codes assigning style sheet rulesto a subgroup of elements to an element globally to an individual element assignLabelEvents( ) function assignment operators (=) assuring a page loads in its frameset "at-rules", @import atob( ) method auto-focusingfirst text fields invalid text field entries auto-scrolling pages auto-tabbing for fixed-length text boxes autofocus( ) function avoiding being "framed" by another site