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<html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>.triangle-left { width: 0; height: 0; border-top: 25px solid transparent; border-right: 50px solid #555; border-bottom: 25px solid transparent;}</style></head><body><h2>Triangle Left CSS</h2><div class="triangle-left"></div></body></html>