我知道fegaussianblur及其影响，但这似乎对我没有帮助。我从here找到了下面的代码，这在CSS中很有用，但在SVG中这种类型的东西是否可行，没有路径或CSS？
h1 {
font-family: "Helvetica Neue", "Helvetica", "Arial", sans-serif;
font-size: 50px;
padding: 80px 50px;
text-align: center;
text-transform: uppercase;
text-rendering: optimizeLegibility;
color: #131313;
background-color: #e7e5e4;
letter-spacing: .15em;
/*Important Code Below*/
text-shadow:
1px -1px #767676,
-1px 2px #737272,
-2px 4px #767474,
-3px 6px #787777,
-4px 8px #7b7a7a,
-5px 10px #7f7d7d,
-6px 12px #828181,
-7px 14px #868585,
-8px 16px #8b8a89,
-9px 18px #8f8e8d,
-10px 20px #949392,
-11px 22px #999897,
-12px 24px #9e9c9c,
-13px 26px #a3a1a1,
-14px 28px #a8a6a6,
-15px 30px #adabab,
-16px 32px #b2b1b0,
-17px 34px #b7b6b5,
-18px 36px #bcbbba,
-19px 38px #c1bfbf,
-20px 40px #c6c4c4,
-21px 42px #cbc9c8,
-22px 44px #cfcdcd,
-23px 46px #d4d2d1,
-24px 48px #d8d6d5,
-25px 50px #dbdad9,
-26px 52px #dfdddc,
-27px 54px #e2e0df,
-28px 56px #e4e3e2;
}<h1>Shadow Effect</h1>