[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] [Z] & (ampersand)entities 2nd 3rd in URLs in XHTML @ at symbol [See at-rules]\\\\ (backslash), CSS2 escape characters and object attribute (<applet>) object model (HTML v4.0) <object> tags 2nd obsolete tags [See deprecated tags]\: (colon) and pseudoclasses , (comma) in styles { } (curly braces) = (equals sign) for tag attributes offset [See alignment]<ol> tags 2nd < (less-than sign) <!-- --> tags 2nd omitting HTML tags onAbort attribute 2nd onBlur attribute onChange attribute 2nd onClick attribute 2nd onDblClick attribute 2nd onError attribute 2nd onFocus attribute onKeyDown attribute 2nd onKeyPress attribute 2nd onKeyRelease attribute onKeyUp attribute onLoad attribute 2nd 3rd onMouseDown attribute 2nd onMouseMove attribute 2nd onMouseOut attribute 2nd 3rd onMouseOver attribute 2nd 3rd 4th 5th onMouseUp attribute 2nd onReset attribute 2nd 3rd onSelect attribute 2nd onSubmit attribute 2nd 3rd onUnload attribute 2nd % (percent sign)for character encoding in URL encoding + (plus sign) in URL encoding # (pound sign)for entities for name anchors in URLs <optgroup> tags <option> tags ? (question mark) in URLs 2nd " (quotation mark)for attribute values 2nd in URLs ordered (numbered) lists 2nd list marker style properties nesting numbering style using appropriately orphans ; (semicolon) in character entities / (slash)in ending tags in URLs 2nd [] (square brackets) ~ (tilde) in URLs outset borders overlining overriding hyperlink targets
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