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| Display raster (bitmap) graphics | All browsers after Mosaic 1.0 (1993) |
| Support HTML forms | All browsers after Mosaic 1.0 (1993) |
| Interpret HTML tables | All browsers after Netscape 1.1 (1995) |
| Play sound files (WAV, AIFF, AU) without an external application | All browsers after Netscape 1.1 (1995) with plug-ins (usually shipped with browser) |
| Display animated GIFs | All graphical browsers: animation is built into the GIF89a graphics standard |
| Support HTML-3 (Netscape) frames | Netscape 2.0 (1995) or later; MSIE 2.0 (1996) or later; AOL -- ? |
| Interpret JavaScript | Netscape 2.0 (1995) or later; MSIE 2.0 (partial support even in current release) |
| Play Java applets | Netscape 2.1 and later (1996); MSIE 2.0 and later |
| Play Shockwave Director or Flash movies | Netscape and Microsoft browsers with plug-in (1996) |
| Play video (AVI, Quicktime) | Netscape and Microsoft browsers with appropriate plug-in (1995) |
| Support Style Sheets | Netscape and MSIE 4.x (1997) both provide partial support; full support is promised in the 5.x browsers (1999?) |
| Allow layering of page elements | Netscape 4.0 (1997) supported a proprietary <LAYER> tag; MSIE 4.x (1997) supports the more powerful Dynamic HTML approach |
| Permit changes to HTML page elements without reloading | Only Microsoft 4.x browser (1997); Netscape to support DHTML in its next browser release (1999?) |
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