I would try to add explicit quotes when you recall the onMouseOut function, that is:
imageButton.Attributes.Add("onmouseout", @"onMouseOut(this,'" + hfPictureContent.Value + "')");
>>> UPDATED ANSWER <<<
The problem is due to line breaks in Base64 when you pass it to onMouseOut
function. Using the HTML you provided (here below) I was able to reproduce the issue:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<script type="text/javascript">
function onMouseOut(item, value) {
item.src = "data:image/png;base64," + value;
}
</script>
</head>
<body>
<input
type="image"
name="ctl00$ContentPlaceHolder1$rptCompanyProfile$ctl00$rptCompanyProfile$ctl00$ImageButton1"
id="Image1"
onmouseout="onMouseOut(this,'/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAUAAA/+4ADkFkb2JlAGTAAAAAAf/b
AIQAAgICAgICAgICAgMCAgIDBAMCAgMEBQQEBAQEBQYFBQUFBQUGBgcHCAcHBgkJCgoJCQwMDAwM
DAwMDAwMDAwMDAEDAwMFBAUJBgYJDQsJCw0PDg4ODg8PDAwMDAwPDwwMDAwMDA8MDAwMDAwMDAwM
DAwMDAwMDAwMDAwMDAwMDAwM/8AAEQgAUABCAwERAAIRAQMRAf/EAKMAAAIDAQEBAAAAAAAAAAAA
AAcIBAYJBQMKAQACAwEBAAAAAAAAAAAAAAAEBQIDBgEAEAABAwIEAwUEBQkHBQAAAAABAgMEEQUA
IRIGMRMHQVFhFAiBIjIVcVIjM1SRodFCYoI0FgmxwVMkNTYXklY3GBkRAAIBAgQDBQcFAQAAAAAA
AAECABEDITESBEFRBWFxoSIT8IGRscHRFOEyUrIjFf/aAAwDAQACEQMRAD8AO8VuOyl5v55JjIcU
vmxG3lpRXUeKQaYyTXQrEV4mHhKgHslcatmzFSHFSZBdcKzq1GuFb7tAxh6WWIETX1K9V3xcJvTb
YsZFuscUIbvd7aUC9NdWn344KTVLaCQCBmo8cssOdjZDAXD7vvKLrFfKIpcG0usRg8thciU6oJba
05VrSurs4YakwYCsIFk2vGnPtx5k7yqHNK5mlSatoOagTlTgch25YrZ6Qi3bBkyaz09ajzEMQ3rh
PjPraamuOBLSoyfhVoczqSceBMkQspC5shp1xcKlpQwko50YJUh9PHS42f7yK9mPFQc5TqplC90k
6yyLdvCzWyS3GbgrcS1IDjYbSW1j3yU0NM6Up9OFfUNqfTLLmIbtbgc6TH6/muD+Fi/FzOCfu/rf
R44y/wCVdhv46y5Hbjz5kS2HNQL7gUKcPfVjVXtqCxavEzPreoAOyDqZYp8Bu63RwlTEFLshaUiq
iGxUgfTTChtkGuU7YwTdELFAn9I98bwm3LdLG3H/ACK3FvpaSnQ4t1aislA7U55n+3DpN0q4CXp0
12UMT9537b0A3PuuKWYMB63Ot0U60pKk5kZkmlKK8D7MWLudWWMmenFTQ4CT3/TPvywWWZdGnEok
B/yzUZokK5SvddcUoklNBkK5k48b5Aqwwln4AOAbGDK5en/eLCk3BccNRF0XIYbUStBJqCa94yPd
jq7oGVPsGXLGDe6bUfiO3GOW5Lr0RorSy24mqUk0JKBRfE0qB+TBIaoi11oYFJUoQ5qFMKec5B5j
MkjQsaT8SchWhxMrqEipoaxp/wDnJ/8AFW//AGTX4h/G/W48f2OOM/8A84cj+/wjT8gc+2bc2yzK
uO27e5EtikEqWVuUpr94540Fy0zLgOMzysMIG9/IgWLZe9J94eFuh2yDIdnSCkkoQkZgAAkk8ABx
wjKlbtOMZW8QJX+iu8dgdRbFEk7QvsS5Oso/zFuWUplMqGR5jQIcQa9+WCLW2KYEYzQpuVuCqmMF
AQIoWlqOgdi3G1lK6jvNAT7Tgq2NPCdZdWZnpMh+bOl+K44xXUUrKFAnKhJBrjtzHMSsLScSXbba
gKjLaQQoa3EhIGfccsD1UGk81SKzPjqrtCK3InMxHYs2JLW6lTDhCHo+oLWtbZPw/Aag5Gnfgq2p
pgYj3LDUcKRB+osTb8Uu/Lo8iG0lpKzGdIV9oKklLgJqFDv4+PHFq1qIPB98gV+GR/tv578Q/hv8
Xh+bFfq/3pLtP9az6l9nblU1tmLGMQq8opTYUBxoojDFb9FyyMVBYFerMJMrbe8lCO1KclR9UWK7
QIU/rTykqJBpVYHZjNX7mu4zEUxjnarpKiI5sfbVzbtrnU+Xs1Ni3bYru9b5jLb7S35TbagRIZW0
GnQ2oHLUkpOYrlgprTJa1h6jlxjS1eVr1Db09vAxntz3XcUXbyLhAusyxSbrETIbltx0vrQlxPuK
KHPdBqe3HS5UauyMnII4chFr231l9SzjssWre+y+olvtkjlSYi4vkpqAgn3Hlt6kIKk5VNE1zrTF
h3IZeI7aRd6dwNSoPZkfrGp2xvJe6rcqfLtcmyXdhSGrnZ5SSlxl6mopT2LSewg0wvZsTzhunLkY
qnXCxptkmXdVRl+Vk3Bl1qQVKAZSUAKSrScxUkkDB+2cFYi6haIeJFvvo/1DvG3Lrunb+z7rJs0f
mOtzFUZbdaQlRc5CHilx3Sn3yG0mgxcdzbRgGNK5ShNleZC4XAZzQX/1ntv/AGq1/wCBP5c+/V/r
X+Dx4/tYW6zzOeqdr9ppt0+tsZ7bLSympU6vP97GoVaL74lBgX6vN/LrVKcSgFkXm3tyEq4FtboB
B9tMZvfDTcJ7RH/ShqdR2GDaRbm3XrZbLcE8qS8h2a2VFXLjIIK8jXTq4CvfjxBwA4zRpYQZwpSB
bLw7MtqFJZQlhuKEKKa0pxQFdnZTtwQHDEqJC5t/IK98Dm2OiG3trfzpGTY3pL+9Vsruk+IkV1Rw
UNOR9J+wVpNFFAST2kjFltri2mtHEGAbjboby3gPMO0y3Ks8Pb8BuIhbq1xUBJ5qhzaJTRIUQSCa
cSDhTebQNJ4Q6ypZqwXSoLO8dwW+2KhszHLcHZKW3TqZSUitSDlUkAVI4VwNYvXHOhZfudvbH+jD
uhCt1ukXFCmdzW4fO/OsxmpaXlOtGM62VNtNNqADSUtqPMSOJHdhneTSlGxOGPfw7KSm64t2iVOF
Dh7Z9kMNT3fr6vZ3YrmX0ws9NGx/KjI/WDzlf+rGqGAidYIetcFb+3LyhoDmquNuLZIrn5lvsxn9
+pLmnMR70ttLqe/5RI9l7m33Ytw3+42puPeOY4pubAuGvSC2dQLakpUU5DTQihxDbK4fDGaa/fR0
DZQswLhvK+uC9Xr5M3FlPofcbt0d9ElopJC2g44sJVUZZpRp8cX3dtUhq8ccPCS2+68uk5Uwx8YT
7Bvpxy1Tbc+gC5WpRaknipSDm25XL4k8fGuIPeNtCvL5SPpLcatcIP8AdF0cdZU9HKlOvAk9g1U0
5+GeEO4eorLrQINJxumMGFcL9eoku4qimNEDsxxtxLbziFLGpKSeAPBRGdDjvTk1McchLd4GCrQV
xjDWi1/HJUyUR23nVW4qrqc15F9Wqp95PuivZ4Uw2oT8fYzOdQ3IbyKe/wC3una5A/PiNIsh16a2
6GzsqNKlaGGtTrj77xCEJAUakqUQABjXUAGMRoTj3xPPUZ6h+gm2fP7UY6mWS67yuUqD8l27aXhc
XDKbkNrCH1RtbbIISQS4oYS79PMWUcj8I46dcAZQTmafGLE7aYczcyN22zcE/Zz11SpcS4sF16C8
EkpLMlhKgCCmhChQ+OWA7D1ck5GauytsW9D17xn41HhL+uP1CfEdNq6kbdDS3Sn5cmE7OW63UEUb
WtC0Hsrr8Tgu44Az+FfrLfQsUqCxNM6AfKktDNtk2J+RMv0qO7NREWHlxQpCHQpSS2ClRUQQoHKp
7c88B7jzJjwgVtqXKLkZTN37gjQYzKtSWnFJ1OCvAcQT3fRhBcWuAjmwQRjC16abNabrtfce6HUs
TbxdLmlDzLiApyNFaQFRTpUPdDupSwRxH0Ya9O2+lCSMT8pnes7sve0KcFFPec/pGHkRjU1GeDGS
JpB8r+z24hQz2M+YfdXUzqdvaIiFu/qFuPccFo1bt1wuUl2Mk8SQwV8uv7uH1Iu0jlBe2y4w42/F
/wAu8ytLrLiMihaDqSoU7QRXHiK4SdaYibc+mjqrtHqT0627FuU2Erc1pjmLfbItSUupfQaFwNqN
Slwe8CMKWtemdJy4TWbPc27yBj+7j3xj5E3Z1oiLntqYgLYGpVPiV9JJrT244zIMYa4JyOEAt53t
Hvc1yeHXExkKPJj8OYlGaAQMjU9uBLis1QYMrrWoMGN6M7cEppurrweWEiO3VS1laglDaUjipaiE
pA4k0wB6baqAYw83VVak4ZwYepPqN1U9LHqFsx6e7kNouB6c7bh7ktDjbcm3yHI5kc1l9hQKF6HC
oJUKKHYrPGrfaBEROKqB7e+YT8g3Ljv/ACNYX9g/1RrNIt0eP1X6XS2LuhWmTedrPtrjOJ+v5SWp
K0K70hxQ8cDNt3GVD4SwXRxhu/8Aot6Xvx26v4TzP+ir+9/Dfe/eePwftYh6Lfx+Un6i85h+uBzf
skp4ZrPYB3e3DSkBrIjluQkLoM+0Ux4ierGu9B2zrNuz1GM7Wv0BNxtG4tq3liY1UocbUylp9p5l
xNFNuIWgFKkmvsJGL9vZW4SriopKrt5rVGU0NZqdu30aX+3IVP2ncnd4Ws/aNwpLykzWwOAKFK5b
tPClfq4Fv9OK1CN8fvGW36orEeotO7L4QMDp3ueHKegSrRIYmNqCFQuS6l/UckpDOnUonsoM8JLt
p7ZoQazQWtwlwVUig41jgdHehw2HEZ3tva3tp3MohzbtjXRaoCiDpff4p59D7qc+XxJ1/C26b00q
fVu58By/WJOqdTFz/K0fLxPP9PnMpf6mu2XrZ1p2hfHiSvc+z47iic6Kiy5CKD6EqGGW9UUUxRYb
EiZ1Mx1EZCppmO/AAMJnv5VH1Fd/Dt7sdnpeUL8uvQ4PsJVOWo9jlKUPgqmXji0SqQJZCElSRUgE
+A/Tjs5HN/pssqk+q7biszy9u35xZ8PLpT+SqhgjbGhPd9RB9yMB3zZrrF6hZPS65bf2ta7DLeTe
1L83vAtcyLF7m2E1oteYqpXupyACicmlram64rx7YG97SCBnARvLqRvvYtvPUG070ut5srElE+Vb
ltPqWg68wtJUSoHgrUQmmVKZYs3CIqEace8U93tnOWmJYCvz8Y3u2t3/API9hsl9k2mVYJjzKFz7
HMbU2tpxaQdSQqhKFDNJ9hzBwGUZAARC0YNMp/6tlq5d66G3lCKJkW68wFL8WHIroH5HDgXdYoO8
/SW2f3numRsFOoUAqrs/RheYVO3pR3DhX245PT//2Q==')"
src="data:image/jpg;base64,/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAUAAA/
+4ADkFkb2JlAGTAAAAAAf/b%0d%0aAIQAAgICAgICAgICAgMCAgIDBAMCAgMEBQQEBAQEBQYFBQU
FBQUGBgcHCAcHBgkJCgoJCQwMDAwM%0d%0aDAwMDAwMDAwMDAEDAwMFBAUJBgYJDQsJCw0PDg4OD
g8PDAwMDAwPDwwMDAwMDA8MDAwMDAwMDAwM%0d%0aDAwMDAwMDAwMDAwMDAwMDAwM/8AAEQgAUAB
CAwERAAIRAQMRAf/EAIIAAAIDAQADAAAAAAAAAAAA%0d%0aAAcIBAYJBQIDCgEBAAAAAAAAAAAAA
AAAAAAAABAAAQMCBAMEBAgMBwEAAAAAAQIDBBEFACESBjET%0d%0aB0EiFAhRYXEygVJiIzNUFQm
RobHRQoJTNDUWNhfBkrIkVjcYGREBAAAAAAAAAAAAAAAAAAAAAP/a%0d%0aAAwDAQACEQMRAD8AK
kcRWDIaN9lRkLcc5sNp5aUV1HikGmAqbcPZRlOmVKLrhcOrUSfz4BSPMX1S%0d%0ae8fM6d7HjJt
9kjBDd6vTagXpri099gFJ7raKgEDNR45ZYBW4NqdZjB5bC5EpxQS23TKtaVrlThgC%0d%0aDZNrx
pz7bEub4VtelcwJUmraDmoE5U4HIVzywE2az09ajzW48N6fPjvraamuOBLSoyfdVpczqScB%0d%0
aRXJj7TriodLU2yko50YJUl5PHSts9vtIrgCl0u6vSYG67RbZDcZERSw28HGw2koWO8SmhpnSn4c
A%0d%0a7n83xvqsX39fBP0fxvZgCO9tZ2Q5Kmx3dQVJdCk04d9WAFszbk6F9qXJwqUxCDr7iUiqi
lsVIHtw%0d%0aCvS+kO+N4TLluiNtx8QFOKeQylOlxbi1FZKE9qRXM/lwFktnl+3TuuKWYNvet7r
ZCnWlJUmhIzJN%0d%0aNNFerAdKR5ZN+7fscy6tuJbkCR4VqK0aK5au664tVSU0GQrmTgBhcvL/A
LxjlNwcjhuIui5DDaiV%0d%0aoJNQo19IyOAGt12q/FduMctyXXojRWlptxNUpJoSUii8iaVA/Bg
ArKkiJMQphTrnJPMZkEaVjSfe%0d%0aTl2HAMp/ed76zB/pDV7w/fPje9x+RxwG4lvsTlz2zb3IV
pU2StZW5SnM75zwAK341BsO0d5zby6L%0d%0abEtkKQ5OkFJJQlIzAABJKq0AHGuA8Oh27en/AFE
sESRs++w7i8wgeJtqylEplQyPMaBS4g19OWAY%0d%0ay2teEC0MxkDKi3G1lK6j0mgJ+E4D2XCEZ
Z0yIrjjAOopWW1AnKhJBrgK3Mt1sRqirZQQocxxISBn%0d%0a6DlgM8eq+z4zcme1EeizoktbqVR
3Doej6gta1oJHd9w1ByNK8cAg3UKJYIqnPs6PIhtJaSox3SFU%0d%0acFSSlwE1Ch6fx8cAPfsRX
1ZP9PfbfvD93/a8PxYD6m9mbqUzteNGMEr8E4toKA40URXAALq1ETMs%0d%0aW83fDNSXZbIVFiu
0CFSNaOUlRINO+B2YBMdi7aujNsc6pytnJse7LDdnYE1lt9pb0pttQIkMraDT%0d%0aoQoHLUkpO
eeWAavdN43FD223c4F0mWGVdoaZDUxqMl9xCXE9xRQ53Qc+3ALHtzrV5mXnJgtW+dmd%0d%0aRbd
bJHKkxXIngpqAgnuPLbCkIKhlU0TXOoGAaPbe8l7qgLny7ZKsl3YUhu52eUkhxl4AqKU9i0ns%0d
%0aIywCodcbGm2yZl2VGX4WVcWXWpJUqjKSgBSVaTmKkkjAJHvrpB1Cu23Lnuqw7OusiysF11qaq
jLb%0d%0arTaFFzw6HilboSnvkNpNBgH0/wDNVv8A+LN/9D/YH0yv41+x48fXgNTenlrjPbXbWUV
KnnKn9Y4A%0d%0aEdXmRbYktxKElgXu3okJVwLa3QCD8NMBS37S04/arXbgkNSnkOzmyoq5UVBBX
lU6QrgK+nAFiUi1%0d%0aXpybakKSyhMdqKEK01004oCsqcRTtwAW2z0MsG1E72i/YTsuRvZbK7n
cYiQDqYBQ07HCT8wrSaKK%0d%0aAkntJGAsTtnibdgNQg46tyIgJJdI5ulKaAKIJBNOKgcAKZMJr
ee4rdavBszHLdzpKW3TqZBSmtVA%0d%0a5VNKVI4VwBRjWyRMhPR9z25K74qUxGampeU62Yz7ZLb
TTagA0lLaiXEjjT0YAi1/11+D0YA59M2w%0d%0aNpsj9IPu6v8ANgAn1sgresl5QyBzVXO3FsnPP
xDfZgE42Punfdk3Ff7pZ2o15U44pufAuOvSC2dY%0d%0aLakpUU5DTQihwBhgTd435Yvd8VZm40t
9Eh1q2xn0SWikkKaDjiwlVRlUpRp454Al2PfzirPOtshI%0d%0aTc7SS1JXxUpCs23K5e8nj664A
T7tuzj7BejlSnnq1VwGqmn/ABOA5XSi3Q7juC8xZVyVFMWHzprj%0d%0abiW31oUsakpKuANaKIz
ocAwkOBrK3S3/ALVl91dvWqup3XkX1aqnNPdFez1UwE7w/q7cAx3TS3Qm%0d%0adlR5UvlsNa3XJ
Eh4hCEgKNSVKIAAwCZeZDzDdBNsPTdrxupdlu28rjKgGzbetDwuLhlNSW1ht9cb%0d%0aW2yCEkH
mKGAXNm12+budO7IF/uGzF3dKnIN0jF16E4EkoLMmOlQBCk0IIoflCmAJj8XfTyIybT1M%0d%0as
BaW4Ui3NwXZy3m6gija1oWg0HHX6zgOp9nSbG/Jl32VHdltxHEvuRgUIdC1JLYKSVEEKByqe3PP%
0d%0aAD3d9/iworCtSW3FJKnBXgOIr+bAFny0WW1XXbO5tzupYm3i5XNLbzLiApyNEaQFRjpUMg8
VKWCM%0d%0ajT5OAYOTENTl7cBz/Cq+L24D5md1dS+pu9oiYW7+oW49yQWjVq3XC5yXoyTxqGC5y
6/q4AYoZcYc%0d%0abfinw7rK0uMuI7pQtB1JUKcCCK4Db/yxdVdndSenO3Yl0nQjuizxzEvtkWp
KXUvpNOYEKNSlwd4E%0d%0aezswDLTJ2y7PDXcW3GYKo41LT+kr2kmtBn24Bdb3vZi+zXZ4dcRFQ
pXJjcOYlOaAQMjU9uAFl78d%0d%0af5TTYLr/ADlhKY7YKlrLiglDaEjipaiEpA4k0wA08ynUHqn
5WPMHZP7e7lNmuX9uNtw9yWpbbcmB%0d%0aIcjmRzWX2FgoWEOFWlQoodis8AWthfehWmRbmI/Vb
pdKbuyFaZF62s+2qM4n4/hJagtCvUHCMAbP%0d%0a/on5YPrW6/3XxH8FV9J9W+m9/wBfufKwGJK
7fzfmkJ9az2Aej4cBFdtqEhdB7RgGv8h2zbNuzzGM%0d%0a7Wv9vTcbPuLat5YmNVKHG1MpafaeZ
cTRTbiFt1SpJr8BIwGp+7PJnf7ahU/adyd3haz843ClPKTN%0d%0abA4ApUrlu09VK/FwAUPTvdE
KU9AlWiQxMbUEGGWXQ/qOSUpZ0alE9gSM8A4PRroX/IcVnfG+Le2N%0d%0azqIc25Yl0WqAog6X3
6VTz6HupFeXxrr90Mp/vONsvWzrTtG+vFRXufZ0dxROdFRZchFB7EqGAzmY%0d%0aYVSoFTTMHgc
BI8M38Q8a8O30YC9tr8OspcHzEqnLV6HAKUPqUBl6/bgIEo6UqUkVIFc+z8+Ac77t%0d%0allUnz
X7cVmeXt6+uL9nh0p/KrAbOdYfMJK6X3Pb+1rVYZbovil+L3iprmRI3obYTWi15iqld1OQA%0d%0
aUeAAjeXUjfexbeeoFo3ndbzZ2JKJ8u3qbfUpB15haSolQPBWohJGVKZYBvts7vPUew2S+ybTKsE
1%0d%0a5lC59kmNqbW04tIOpIUKlCgapPwHMHAZS/e32rl3nobeUIomTbrzAUv1sORXQK+xw4DIi
EnUKAVV%0d%0a2ev1YDs0R8VPCvw4D//Z"
onclick="alert('clicked');"
style="border-width:0px;"
>
</body>
</html>
If, instead, you put the Base64 string on one line one (as shown here below) then it works like a charm!
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<title></title>
<script type="text/javascript">
function onMouseOut(item, value) {
item.src = "data:image/png;base64," + value;
//item.setAttribute('src', src3);
}
</script>
</head>
<body>
<input
type="image"
name="ctl00$ContentPlaceHolder1$rptCompanyProfile$ctl00$rptCompanyProfile$ctl00$ImageButton1"
id="ctl00_ContentPlaceHolder1_rptCompanyProfile_ctl00_rptCompanyProfile_ctl00_ImageButton1"
onmouseout="onMouseOut(this,'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')"
src="data:image/jpg;base64,/9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAUAAA/
+4ADkFkb2JlAGTAAAAAAf/b%0d%0aAIQAAgICAgICAgICAgMCAgIDBAMCAgMEBQQEBAQEBQYFBQU
FBQUGBgcHCAcHBgkJCgoJCQwMDAwM%0d%0aDAwMDAwMDAwMDAEDAwMFBAUJBgYJDQsJCw0PDg4OD
g8PDAwMDAwPDwwMDAwMDA8MDAwMDAwMDAwM%0d%0aDAwMDAwMDAwMDAwMDAwMDAwM/8AAEQgAUAB
CAwERAAIRAQMRAf/EAIIAAAIDAQADAAAAAAAAAAAA%0d%0aAAcIBAYJBQIDCgEBAAAAAAAAAAAAA
AAAAAAAABAAAQMCBAMEBAgMBwEAAAAAAQIDBBEFACESBjET%0d%0aB0EiFAhRYXEygVJiIzNUFQm
RobHRQoJTNDUWNhfBkrIkVjcYGREBAAAAAAAAAAAAAAAAAAAAAP/a%0d%0aAAwDAQACEQMRAD8AK
kcRWDIaN9lRkLcc5sNp5aUV1HikGmAqbcPZRlOmVKLrhcOrUSfz4BSPMX1S%0d%0ae8fM6d7HjJt
9kjBDd6vTagXpri099gFJ7raKgEDNR45ZYBW4NqdZjB5bC5EpxQS23TKtaVrlThgC%0d%0aDZNrx
pz7bEub4VtelcwJUmraDmoE5U4HIVzywE2az09ajzW48N6fPjvraamuOBLSoyfdVpczqScB%0d%0
aRXJj7TriodLU2yko50YJUl5PHSts9vtIrgCl0u6vSYG67RbZDcZERSw28HGw2koWO8SmhpnSn4c
A%0d%0a7n83xvqsX39fBP0fxvZgCO9tZ2Q5Kmx3dQVJdCk04d9WAFszbk6F9qXJwqUxCDr7iUiqi
lsVIHtw%0d%0aCvS+kO+N4TLluiNtx8QFOKeQylOlxbi1FZKE9qRXM/lwFktnl+3TuuKWYNvet7r
ZCnWlJUmhIzJN%0d%0aNNFerAdKR5ZN+7fscy6tuJbkCR4VqK0aK5au664tVSU0GQrmTgBhcvL/A
LxjlNwcjhuIui5DDaiV%0d%0aoJNQo19IyOAGt12q/FduMctyXXojRWlptxNUpJoSUii8iaVA/Bg
ArKkiJMQphTrnJPMZkEaVjSfe%0d%0aTl2HAMp/ed76zB/pDV7w/fPje9x+RxwG4lvsTlz2zb3IV
pU2StZW5SnM75zwAK341BsO0d5zby6L%0d%0abEtkKQ5OkFJJQlIzAABJKq0AHGuA8Oh27en/AFE
sESRs++w7i8wgeJtqylEplQyPMaBS4g19OWAY%0d%0ay2teEC0MxkDKi3G1lK6j0mgJ+E4D2XCEZ
Z0yIrjjAOopWW1AnKhJBrgK3Mt1sRqirZQQocxxISBn%0d%0a6DlgM8eq+z4zcme1EeizoktbqVR
3Doej6gta1oJHd9w1ByNK8cAg3UKJYIqnPs6PIhtJaSox3SFU%0d%0acFSSlwE1Ch6fx8cAPfsRX
1ZP9PfbfvD93/a8PxYD6m9mbqUzteNGMEr8E4toKA40URXAALq1ETMs%0d%0aW83fDNSXZbIVFiu
0CFSNaOUlRINO+B2YBMdi7aujNsc6pytnJse7LDdnYE1lt9pb0pttQIkMraDT%0d%0aoQoHLUkpO
eeWAavdN43FD223c4F0mWGVdoaZDUxqMl9xCXE9xRQ53Qc+3ALHtzrV5mXnJgtW+dmd%0d%0aRbd
bJHKkxXIngpqAgnuPLbCkIKhlU0TXOoGAaPbe8l7qgLny7ZKsl3YUhu52eUkhxl4AqKU9i0ns%0d
%0aIywCodcbGm2yZl2VGX4WVcWXWpJUqjKSgBSVaTmKkkjAJHvrpB1Cu23Lnuqw7OusiysF11qaq
jLb%0d%0arTaFFzw6HilboSnvkNpNBgH0/wDNVv8A+LN/9D/YH0yv41+x48fXgNTenlrjPbXbWUV
KnnKn9Y4A%0d%0aEdXmRbYktxKElgXu3okJVwLa3QCD8NMBS37S04/arXbgkNSnkOzmyoq5UVBBX
lU6QrgK+nAFiUi1%0d%0aXpybakKSyhMdqKEK01004oCsqcRTtwAW2z0MsG1E72i/YTsuRvZbK7n
cYiQDqYBQ07HCT8wrSaKK%0d%0aAkntJGAsTtnibdgNQg46tyIgJJdI5ulKaAKIJBNOKgcAKZMJr
ee4rdavBszHLdzpKW3TqZBSmtVA%0d%0a5VNKVI4VwBRjWyRMhPR9z25K74qUxGampeU62Yz7ZLb
TTagA0lLaiXEjjT0YAi1/11+D0YA59M2w%0d%0aNpsj9IPu6v8ANgAn1sgresl5QyBzVXO3FsnPP
xDfZgE42Punfdk3Ff7pZ2o15U44pufAuOvSC2dY%0d%0aLakpUU5DTQihwBhgTd435Yvd8VZm40t
9Eh1q2xn0SWikkKaDjiwlVRlUpRp454Al2PfzirPOtshI%0d%0aTc7SS1JXxUpCs23K5e8nj664A
T7tuzj7BejlSnnq1VwGqmn/ABOA5XSi3Q7juC8xZVyVFMWHzprj%0d%0abiW31oUsakpKuANaKIz
ocAwkOBrK3S3/ALVl91dvWqup3XkX1aqnNPdFez1UwE7w/q7cAx3TS3Qm%0d%0adlR5UvlsNa3XJ
Eh4hCEgKNSVKIAAwCZeZDzDdBNsPTdrxupdlu28rjKgGzbetDwuLhlNSW1ht9cb%0d%0aW2yCEkH
mKGAXNm12+budO7IF/uGzF3dKnIN0jF16E4EkoLMmOlQBCk0IIoflCmAJj8XfTyIybT1M%0d%0as
BaW4Ui3NwXZy3m6gija1oWg0HHX6zgOp9nSbG/Jl32VHdltxHEvuRgUIdC1JLYKSVEEKByqe3PP%
0d%0aAD3d9/iworCtSW3FJKnBXgOIr+bAFny0WW1XXbO5tzupYm3i5XNLbzLiApyNEaQFRjpUMg8
VKWCM%0d%0ajT5OAYOTENTl7cBz/Cq+L24D5md1dS+pu9oiYW7+oW49yQWjVq3XC5yXoyTxqGC5y
6/q4AYoZcYc%0d%0abfinw7rK0uMuI7pQtB1JUKcCCK4Db/yxdVdndSenO3Yl0nQjuizxzEvtkWp
KXUvpNOYEKNSlwd4E%0d%0aezswDLTJ2y7PDXcW3GYKo41LT+kr2kmtBn24Bdb3vZi+zXZ4dcRFQ
pXJjcOYlOaAQMjU9uAFl78d%0d%0af5TTYLr/ADlhKY7YKlrLiglDaEjipaiEpA4k0wA08ynUHqn
5WPMHZP7e7lNmuX9uNtw9yWpbbcmB%0d%0aIcjmRzWX2FgoWEOFWlQoodis8AWthfehWmRbmI/Vb
pdKbuyFaZF62s+2qM4n4/hJagtCvUHCMAbP%0d%0a/on5YPrW6/3XxH8FV9J9W+m9/wBfufKwGJK
7fzfmkJ9az2Aej4cBFdtqEhdB7RgGv8h2zbNuzzGM%0d%0a7Wv9vTcbPuLat5YmNVKHG1MpafaeZ
cTRTbiFt1SpJr8BIwGp+7PJnf7ahU/adyd3haz843ClPKTN%0d%0abA4ApUrlu09VK/FwAUPTvdE
KU9AlWiQxMbUEGGWXQ/qOSUpZ0alE9gSM8A4PRroX/IcVnfG+Le2N%0d%0azqIc25Yl0WqAog6X3
6VTz6HupFeXxrr90Mp/vONsvWzrTtG+vFRXufZ0dxROdFRZchFB7EqGAzmY%0d%0aYVSoFTTMHgc
BI8M38Q8a8O30YC9tr8OspcHzEqnLV6HAKUPqUBl6/bgIEo6UqUkVIFc+z8+Ac77t%0d%0allUnz
X7cVmeXt6+uL9nh0p/KrAbOdYfMJK6X3Pb+1rVYZbovil+L3iprmRI3obYTWi15iqld1OQA%0d%0
aUeAAjeXUjfexbeeoFo3ndbzZ2JKJ8u3qbfUpB15haSolQPBWohJGVKZYBvts7vPUew2S+ybTKsE
1%0d%0a5lC59kmNqbW04tIOpIUKlCgapPwHMHAZS/e32rl3nobeUIomTbrzAUv1sORXQK+xw4DIi
EnUKAVV%0d%0a2ev1YDs0R8VPCvw4D//Z"
onclick="alert('clicked');"
style="border-width:0px;"
>
</body>
</html>
P.S.: actually Firefox seems to be the only browser which handle correctly multiline Base64 even in "src" attribute (at least on my PC): Internet Explorer and Chrome fail to set the src attribute too, so it is advisable to remove line feeds even for base64 data in src attribute